Hi Oddpomme.
Yep, unfortunately it sounds like peri.
Most of us feel like you do, I still do some days, and I'm post meno!
Keep pushing yourself cycling, as much as you can, like everything you'll notice ups n downs.
Well done for that, I don't think I'd be able to get my leg OVER a bike now , let alone ride one! Lol......
Good luck, keep us informed,,,,,,,,xx