In perimenopause my fatigue and brain fo

Nothing you described is an emergency tonight, so the honest headline is: your follow-up visit is the door — the next 24 hours are about protecting sleep and settling the online-cream question, not trying another product.

Your question first: testosterone for energy and brain fog

Testosterone is not a standard or recommended treatment for tiredness or brain fog in perimenopause. The trial evidence in women is small and best studied around low libido / sexual function, not cognition or energy. A testosterone cream or "energy" product sold to you is a marketing claim, not an established treatment.

Being straight about what I checked: I read the current NHS page on menopause and perimenopause symptoms today (11 Oct 2026; page last reviewed 19 May 2026). No coverage of testosterone on that page at all. What it does confirm is that mood changes, poor memory and concentration are listed symptoms, that these "may feel worse if you have sleep problems and feel very tired" — and that hot flushes and night sweats are what break the sleep in the first place. So: treat my testosterone answer as the general clinical picture to raise at your visit, not as something I can cite today.

What *is* well supported enough to make it your first two questions at the visit: treat the sleep (night sweats are the mechanism) and talk about hormone therapy properly — a prescription conversation with a clinician who knows your history, which your notes say your doctor has already suggested. Not a shopping decision.

1. What you've tried vs. the better lever

Tonight, ~20 minutes, four moves:

1. Protect one sleep block. Pick the earliest possible night — ideally tomorrow. No school run, no elder duty on that one night if it can move. One protected night is worth more than a week of tidying. Say no to one thing to get it.
2. Cool the room, not yourself. Layers you can shed, water within reach at the bedside. Night sweats are the driver of the broken sleep.
3. Protein at the first meal, water through the day. Food you already have. A low-protein first meal is a common cause of the 4pm crash in caregiving weeks. No new powders, no new supplements.
4. Ten minutes' walk, in daylight if there's any. Not exercise for its own sake — the cheapest lever you have on tonight's sleep.

A good 24 hours — not a cure: one protected sleep block, the cream question written down and in the bag, and no new purchase. That's the win.

2. Hold these lines — please

• Don't increase, layer, or experiment with the online cream, and don't put a second product on top of it. Two overlapping hormones of unverified content is exactly how a visit turns into a confusing picture.
• Don't start iron, "menopause blends", or anything bought online — iron especially, even with a past low result. That is a clinician-level conversation.
• Don't start, stop, or double anything prescribed, including a prescribed HRT, pill or patch, on the back of a tired night.
• Don't buy prescription hormone medicine from an online seller. Unregistered products aren't checked for content or amount.
• Don't settle on "it must be menopause" and leave other causes unchecked. Fatigue and fog have ordinary, treatable causes — thyroid, iron, medicines, sleep debt, low mood — and the visit is where they get looked at.

3. Red flags — when to stop DIY

Emergency number, now: pain or pressure in the chest; breathlessness at rest; sudden one-sided weakness or slurred speech; a sudden worst-ever headache; fainting; or confusion — the fog becoming "I don't know where I am, I'm not making sense" rather than "I can't find my words." A caregiver who suddenly can't manage her own normal day is an emergency, not a bad week.

Same-day call to the clinic — don't wait for your appointment: any vaginal bleeding more than 12 months after your last period (the NHS flags this as needing checking even once, even if small); bleeding that gets heavier or changes pattern while you still have periods; a noticeable fluttering or fast heartbeat; a new breast lump or one-sided bloody nipple discharge; one-sided leg swelling; thoughts of harming yourself — say that one out loud, to a person.

Decision tree

• New, sudden, or much worse than last week? → not a hormone-tuning question. Clinician this week.
• Worse only after a bad night or a heavy caregiving week? → the sleep lever *and* the visit. Both.
• Any bleeding 12+ months after periods stopped? → clinic, don't wait.
• Wanting to try a hormone product? → after a clinician reviews it; never from an online seller.

Screenshot this for the visit

• "I want to talk about hormone therapy options for hot flushes and sleep, and about brain fog."
• "I've been buying a [name] cream online. Is it regulated, and should I be on it?" — hand over the tube.
• "What should make me come back the same day, and what do I do tonight if I'm worse?"
• "Which of my current medicines could be adding to the tiredness?"
• "Does what I already take — including the cream — stack with what you'd suggest?"

The one thing I'd ask you

Have you actually started the HRT your doctor suggested, or is it still being decided — and are you still having periods? Whether the online cream is an add-on on top of something prescribed changes what the clinician needs to know before they advise you.

*This is not a diagnosis and not a medicine plan — your clinician decides that at the visit. Checked 11 Oct 2026: NHS, "Symptoms of menopause and perimenopause" (page last reviewed 19 May 2026).*