I definitely know what you mean. I always feel that same sinking feeling when my therapist cancels our appointment or leaves. I'm not sure if it's "wrong", but I think it's safe to say that a lot of people become attached to their therapist because they're the ones who are there to help us grow and overcome.

I'm sorry that no one seems to understand. I think you should tell your therapist how you feel though. I know he'll understand and be able to help you deal with your attachment appropriately. He's your therapist and that's what he's there for: to help you.