It's not a mistake to be here. I think if you keep posting, getting it out you will feel better. I find this place supportive and people very friendly.
Your fiancè doesn't sound very in tune with your problems. If you can't lean on him, who can you lean on. His dismissing you as stupid is cold and unsupportive. I even wonder if this relationship is helping your situation. Is it generally good ? Does he make you happy ? Any relationship is not better than a bad one. Should you two be together and contemplating marriage ?
Talking on here will help. Unload away.