On and off period guilt (maybe triggering?)

I’ve had anorexia for years now but I’m technically in “recovery” at the moment. I got my period today after 4 months of not having it. I haven’t changed food or exercise and haven’t noticed any weight gain. Suddenly I feel awful about myself and I’m really worried I look like I’ve let myself go. Logically I know I’m still around the same weight as all my size 6 clothes fit exactly the same way, I don’t know why I feel so bad but I just hate not feeling in control. Does anyone else have this? Xx