HELP!!! HAIR LOSS--FREAKING OUT!!!

I am 48 yr old female.....I,m experiencing a TON on hair loss....its thinning all over, no patches...this has been going on for over a year...have seen two derms....which could have been less interested!  and then my GP who did blood work...everything came back normal...
I have never had thick hair..but I would say fairly normal...but now its horrid!!!!  Every morning when I comb my hair at least 50 hairs coming out ...and then throughout the day,  I see them falling all out on my clothes....find them all over the house and pillows ect....My scalp is now becoming see through...

I do have a microadenoma (pituitary tumor) which I had been taken parlodel 2.5....thought this might have something to do with it...but I havn't been taking it for several months now and nothing seems to have changed...
Other than that I havn't taken any medications etc...  I havn't had a period in several months, not sure if going thru the change or if its due to not taking my parlodel...   Also I have been recently diagnosed with DCIS breast cancer and having mastectomy this friday... no chemo or radiation, so hair loss not related to chemo... I am in so California....anybody have any suggestions on anything I can take , causes or physician I can see???  I am desperate!!  thanks  patty