Hey everyone, again.

I have an issue.. I recently relapsed (drug use) and I am horrified to tell my therapist. I never even told him I did any drugs because I wasn't using for 3+ years. I am in my early 20's and this is driving me nuts. I don't want to hide things from him. I see a psychiatrist too but I don't see myself needing to tell him since the medication I am on now is good.

The drugs are in the prescription and some herion sorry of thing.
I don't want my therapist to think less of me.. I see him next week and I am scared that I will just run out of the room.

Did anyone ever experience this? I feel like I shouldn't even tell him..