Yes I can see why you’d try increasing estrogen if on a low dose, you may not need to do so long term? I worry about the 5-htp though, long term use would not be advised but you’re likely planning a short term thing so not so much of an issue. Studies show it likely only works as much as a placebo for depression.
I definitely felt covid affected my hormones and general health for maybe around 6 months, my daughter also, and we only had it mildly. The worst thing was fatigue and breathlessness. It passed though, eventually. I have taken vitamin D for years, so if you don’t you may consider it. Hope you feel better soon.