Hypochondriac/physcomatic vs. actually symptoms/dying.?

i have chest pressure, muscle aches/twitches, shortness of breathe, anxiety, headaches, throat aches, and stomache aches. these were checked out and i was diagnosed with being physcomatic which is basically mentally making myself sick. these pains im having are real and scary and idt im doing it to myself and it seems like if the doctors dont find out whats wrong with me im going to die soon. any ideas or help?