For Weeks Now I Have Been Tired, I Am Not

For weeks now I have been tired, I am not sleeping well, I am nauseous all the time, I am extremely constipated, my skin is breaking out all over my arms, legs, stomach, face, rear, I have mood swings, I get pains in my stomach a lot. Medicine does not help these things and I can not find a way to feel better. What could these be symptoms of?