I would definitely go to your doctor and talk to him/her about this. I had this happen to me also after some surgery. When my doctor tested my blood, (eight months after surgery because I was complaining of hair loss) I had a level 1 of iron. She started me on iron pills and brought it back up my iron level to a more normal level. I also went to see a naturopath and started taking Liquid Silica Gel which made my hair feel amazing and my hair growth started to happen quickly.
Good luck, I know it's frustrating. I think there can be so many contributing factors but some simple blood tests might help you out a little!