MayB it's time for a VitD and thyroid function blood test, as as base line from which to work? About 7 years ago I would so 20 mins weeding the have to sit; still; for 2 hours as I had no energy. Blood tests showed that I was low in VitD despite spending a lot of time outside.
Flushes can be eased with HRT and I believe a couple of anti-depressant medications have been found to help.
What does DH suggest?