I get what you're saying @Fancycrab
It is quite normal for body temp to rise after ovulation when progesterone kicks in at the 2nd half of the month and some night sweats are not unusual.
(I used to get those in my mid- late 40s but only for 3-4 days before a period.)
However, yours do seem quite extreme if you're soaking sheets and a duvet. Night sweats for me were a slight trickle of sweat down my chest area.
Living in the age-phobic society we live in (especially if you’re a woman) doesn’t help either. I still have young kids, I still play sports at a high level for my age. I guess I just don’t see HRT fitting in with that
You're being ageist too because you think HRT is just for old women!
The age of menopause is 45-55, with 51 being average. You do seem to be starting relatively early with your cycle shortening but peri can last for years. There is no point 'fighting' it with thoughts on age-phobia or the age of your kids etc. It's not something you can control. 1% of women are post meno before 40.
The most important thing is quality of life. That's what HRT is there for, regardless of age etc.
Being honest, there are no 'alternatives' that work as well as HRT. You could spend months trying herbs etc and get nowhere. If they did work, they'd be prescribed. The science and research shows that it's 40% placebo effect with the supplements being sold.
Weight gain- it's very individual. I've used hrt for over 15 years and am the same (low ) weight I've always been. It's not a given you'd put on weight.