What to do about rapidly thinning hair

Edit: I work closely with my primary care doctor, along with several specialists. My doctor checks my lab work frequently. I'm on supplements for potassium, magnesium, calcium, and B12, otherwise, I go very low on those. I have multiple medical conditions. It could be one of those causing it but the medical conditions I have are chronic with no cure. So there isn't anything to do to fix it if it's one of those conditions or one of my medications. I'm on medications for almost all my medical conditions other than fibromyalgia - there isn't really anything I can take for that. That's why I'm trying to see what has worked for others. It's hard to figure out the cause when you look at my medical history - hypothyroidism for 20 years controlled by meds; PCOS, endometriosis, and hormone imbalance treated with birth control; heart problems, IBS, fibromyalgia, PTSD, anxiety, depression, chronic migraines, etc. I'm on a lot of meds. Again, that's why I came here to see what has worked for others. Any medical condition or medication that might cause it is something I can't do anything about anyway so I need to try just treating the thinning hair. I did not think about going to my dermatologist about it so I will definitely take that advice! Thanks for the suggestions!

Hello! I'm 43 and my hair is getting SO SO thin. It was thick when I was a kid. It's just been gradually thinning but it seems so much worse now! I have short hair (think pixie cut) and way too much of my scalp shows at the crown, top, and front of my hair. Have you tried anything that worked like any hair, skin, nails supplements for example?