Sounds like you may not be absorbing transdermal HRT ( well patch and gel anyway).
Are you peri or post menopausal?
If peri, could severe fluctuations be causing the sudden drop?
If post, levels do tend to flatten eventually and then you just need to get the dose right ( somehow).
Some ladies need a high dose to function. I think once you hit 6 pumps or 250 patches, it may be time to seek the advice of a MS. Maybe try lenzetto spray? It’s quick and easy to use and you may absorb that better, I don’t know. Or, look at tablet HRT?
Good luck, it’s a hard journey to navigate!
🌸🤞