I think I have Munchausen syndrome.
What is Munchausen syndrome and why do you think you have it?
Because I want the attention that goes with having a disease
Diseases are serious and it is wrong and immoral to lie about having a disease that you don't have. You can get attention by doing positive things.
But being sick is attractive.
I'm not sure what you mean by that, but pretending to be sick in order to get attention is a really inappropriate thing to do, because it's just like lying to them. I suggest you talk to a professional about what you're doing.