I think i may have Mental Disorder! Bi-polar , anxiety , depress

I am always irritable and get angry very quickly . I am always thinking the worst case scenarios for everything.. i don't seem to be very happy at all anymore. My brain is always racing with thoughts.. I get panic attacks massive chests pains shakes.. headaches like you wouldn't believe sometimes even back pains.. I am not enjoying anything i don't ever wanna get out of my bed let alone clean..
it seems almost as if everything bothers me.. Sometimes i get mad and then an hour later i act like nothing even happened and i am completely fine.
When it comes to lets my relationships i am always thinking the worst and it is really ruining everything, but its always been that way with anyone.. i am always fearing the worst of everything.
i am tired i am restless .. urgh i just don't know what it is, and i don't have a family doctor so i don't know how to get looked at when it comes to mental issues. What should i do?