"If the genders were the other way around nobody would saying not to leave.
It's gross how sexist Mumsnet can be."
Agree. Her behaviour is not reasonable. I'm not going to tell you to DTMF, because I don't tend that way except in obvious cases of abuse, but the tone of this thread is so different from women asking for help!
Silent treatment is not okay. Yes, you may have mental health issues which she finds difficult, but that is not an excuse for her to behave like this: she should be supporting you and trying to help you get better.
That said, mental health issues can only be fixed by you. You are the one who will have to make appointments, and to your credit it sounds like that is what you are trying to do.
It is difficult enough when you have people trying to help and support you, and you do not have that.
"With regards to seeing a marriage counsellor I did mention this but she replied with "there is nothing to talk about". It seems she gets very immature when trying to deal with these things and I'm thinking she doesn't handle confrontation very well. Her family are very much the same so I'm guessing it comes from childhood."
I'm not great with confrontation either. Talking to someone you're supposed to love about problems with the relationship is not confrontation: or at least, it shouldn't be.
Her 'going mad' when you express concern doesn't sound like she doesn't like confrontation. It's sounds like she doesn't like things not going her way, doesn't like compromise and wants to shut down discussion.
The only way to potentially fix this is by talking, but you both need to want to save the relationship. She cannot dictate terms, and neither can you: you have to agree to something you both can live with and want.