Losing my hair and anxiety

This summer I've noticed I'm losing a significant amount of hair - I have at least one bald patch and quite a lot comes out when I wash my hair. Now I don't know the exact cause, because it might be due to prolonged stress (just finished my undergrad and had a very stressful year), illness, or it could be a hormonal or thyroid related issue. Hopefully I'll find out soon when I see doctors, but in the meantime I'm feeling stressed about it and hating washing my hair because it's a constant reminder. And that's probably making it even worse.

Has anyone else had to deal with this? :(