Rashes, swollen joints, facial swelling, asthma. Autoimmune disorder?

I am generally not happy with the state of my health. I have a lot of symptoms that look like an auto immune disorder , but docs have not been able to identify a specific disorder. The symptoms include rashes , swollen joints, facial or lip swelling, Asthma , and infections that won t clearup for months. The infections often require multiple rounds of antibiotics and steriods. To make things worse I keep gaining weight from inactivity and steriods. I feel tired all the time and think I would feel better if I could loose some weight.