Hello Buttercup,
I have been on this thread a while back. My own exhaustion and in my case joint pain and muscle fatigue is still ongoing. I seem to have maybe 10 ok days each month, the rest of the time is hard. I too used to exercise a lot, even up to a year ago. This week me and my husband were doing our usual hours walk and I had to sit and rest three times.
Also.finding it hard to do daily tasks. I manage about a 1\4 of what I used to do. I do have an underactive thyroid but drs say last full blood count was ok in all points. Am in the process of working on an email to ask what can be going on Tbh I feel I am only able to live a restricted life. I cannot believe this can be down to peri in my case of meno in yours and that nothing can be done.
I would urge you to ask your dr for blood tests to eliminate anything obvious. It could be something that can be put right.
As for how to cope? I exercise carefully when I can, I eat as best I can and have learned that the daily jobs I thought were essential now get left. In other words, simple as it may sound, I try to take each day as it comes. Am fortunate I do not have to work full time.
Fortunately my husband understands this is a physical difficulty I now have as part of this hormonal mess.
I wish you well and if I find any answers that may help I will of course share.