Is it possible to find a support group where you are. This is just the short of thing to share.

Consider that your psychiatrist is prescribing you that medication out of their best intent and desire to benefit you as best they can. I don't believe then there is a reason to fear your medications. Trust that while they may not solve your symptoms thy will certainly help.

Have you told them you have this fear?

I think your anxiety is based in the control you need (OCD). Your diagnosis no doubt makes you feel loss of that control. I think there are ways to cope with this anxiety by developing alternate routines - one you can control.