Just wanted to check in and add some thoughts, although I don't think they're anything different from what others have said.
As far as an emotional affair, I do think it is one, definitely on his side. But I think your side is a lot more complicated because you're in a position where you are vulnerable and not yourself and he is definitely taking advantage of you, and grooming you in a sense. I do think you are a victim in this. I don't think your husband knows everything, because I think if he did he would have the same stance as the rest of us and would want to get you away from this man. I really think you need to tell your husband everything and let him help you. If you don't feel your relationship is in a place where you trust telling him then what about your parents? If you are close to your dad, can you ask him for his help and support through this?
This man (or dr) is not helping you or has your best interest at heart. Trust me, no dr would take you off an anti-d after only three weeks and say you don't need them. Anti-d's (like I said) take 3-4 weeks to BEGIN to start working, but you need to be on them for so much longer for them to actually work and you begin to see long term effects (ie they clear your head enough so that therapy then begins to start to get through). The fact that he took you off those recent ones (and I am assuming others in the past) so soon really makes me think that he's trying to keep you in a vulnerable state because he's either scared you won't need him anymore or some other equally wrong/sick reason. He seems really unsafe to me (maybe not physically but definitely mentally) and I really think, as hard as it is, you need to cut ties with him immediately. Delete his number from your phone and go get a new SIM card so that he can't contact you. Maybe go stay with your parents for a while and have them take you to a new GP. Or alternatively, the hospital for a few days, where it will just be all about you. I really think you should call that Alfred C.A.T number I gave you and try to get their help. Also a few days in the hospital with no contact and professional help that is all about you could be so beneficial right now.
I think with your psychologist, you should try to get in this week and speak with her about all of this. My counsellor often had cancelations during the week and she'll call to let me know or if its an emergency she'll just find a way to squeeze me in.
I really think this man is hindering your progress and the only way to begin to get out of this depression hole you find yourself in is to begin by cutting him out. I feel it could really only have a positive outcome for you in the long run. Make reporting him the least of your worries right now. If when you're stronger and seeing more clearly you want to report him then do it.
We are so much stronger then we think we are and I guarantee you are as well. I've been in a dark hole like you are now, it is possible to find your way out. But I don't think you will be able to until this man is cut out.