That is a hard one. Most "normal" people don't understand. Maybe you can find some information here that might help. Or maybe try to have a third person (doctor,therapist,counselor) help explain it to him. Seems like he thinks it is not for real, which WE know is very much REAL! or maybe he is frustrated because he can't do anything to help when you are having a panic attack. If this is been going on for 6years or more without any relief I do think you need to see someone. It can be really difficult for someone that has never been depressed or had anxiety, OCD. to understand. I wish you the best and don't give up on your relationship it can work out.