Hair loss is one of the main symptoms of hypothyroidism. Have MD check your bloodwork (TSH, T3 and T4).
Have you had blood work done lately like checking your thyroid?
It could be anxiety but have it checked by a doctor, too. If it is, then you should work on your anxiety management( easier said than done, I know!!!!!!!!!!!!!!!!!!!!!!!!).
If it isn't anxiety-related, then your dr should be able to rule out a reason and have it treated. In both cases, you're better off knowing what causes it.
Good luck and keep us posted.