I haven't posted in awhile, but I had to chime in on this one. After about 10 years on mesalamine-based meds (Asacol mostly) I lost about 1/3 of my hair. I had very thick hair though, so it mostly just made it 'normal' to thin in thickness. I switched to Colazal and it seemed to stop. I was in remission for those 10 years by the way, so a flare wasn't contributing to the hair loss.
Then about 3 years ago I went on Prednisone for a year and when I tapered off I lost 3/4 of my hair. Very devastating for a woman and really depressed me. I had to get 3 inches cut off my long hair and it still looked horrible. Had all the tests done (which I've had done SO many times in the past). Thyroid, iron, all vitamin levels were fine. Found out my DHEA was a little low (from an alternative medicine doctor - regular doctors would not test this for me). So I started taking 10mg of DHEA a day. Also my dermatologist finally suggested a laser hair comb, which actually really helped. It made my hair grow back much, much faster (and trust me it couldn't grow back fast enough for me!). It's not cheap though, I think it was over $300, but I was desperate to try anything. It definitely is the one thing that helped me the most and was worth it - 2 years later and I still use it 3 times a week. Still have hairs growing in everywhere, even though my hair is mostly back to normal now (although not as long as it was before, but getting there!).
It's horrible for any woman to go through this. Rogaine never did a thing for me - it's expensive and if you stop using it the new hairs just fall out (my dermatologist confirmed this). I hope you find something that helps out and I"m sorry you are going through this. It's hard for people to understand, they think 'it's just hair', but it is a big deal!
UC - diagnosed 1994, in remission again
Meds: Colazal 3 pills/3x day, 1 mesalamine enema/day, VSL #3 DS 1 packet/day, Ultimate Flora 50 billion, iron, calcium, folic acid, L-lysine, Zyrtec, Yasmin, multi-vitamin, evening primrose oil, zinc
Tried Imuran but it affected my pancreas