Hi, I'm new to this and don't really know where to start.

Well Ive been diagnosed with Bipolar 2 disorder, as well as Mi'ana and PTSD. My issue is my fiancé is convinced that I make up symptoms so that I can get attention from him. I don't know how to explain to my fiancé that these disorders are real and that I have been dealing with it since I was younger and that I'm not just taking medication for no reason. I tried before and it ended up with us breaking up, calling the wedding off, and throwing stuff out the window.

Any advice is much appreciated, Thanks in advance.

That is very insensitive of him. Take him to your doctor and have the doctor explain symptoms and treatment. He could help you greatly by knowing the full impact of the conditions you are plagued with and possibly make you more comfortable in life, if he really cares about your wellfair.