Hi fotogrrl and welcome! I don't know if you've considered any of the Rogaine-like products for your thinning hair? I'm not sure if having seb. derm is a contra-indication for using Rogaine, but I developed thinning hair and my derm recommended it. It definitely has helped me.

I don't use the actual Rogaine - I use generic drugstore stuff. My derm recommended the men's foam since it is the easiest to use, but he said only use it once a day which is half the men's dose and safe for women.

Very best of good luck - I know how upsetting it can be to have thinning hair!
2/c and some 3A.
Protein sensitive but can use occasionally
Highly porous. Color over grey.
Best 1st day method: Super Soaker
Stylers: Mix Curls in a Bottle into everything for shine. Terrible pj
Sometimes try roller sets - classic glamor but I prefer my curls.
Every day is a gift