Yes. This would not automatically preclude you from having surgery. However, like everything, severe disease may put you at higher risk for certain complications.
Probably. Vasculitis alone does not rule out the possibility of having gastric bypass surgery. However, severe symptoms may increase your risk of certain complications. High dose steriods for example may complicate wound healing.
YES. Yes but healing may be slow/complicated.
Maybe. Your candidacy for gastric bypass would depend on the severity of your disease, the ability to control the disease prior to surgery, and the opinion of your surgeon.
Is it possible for you to have gastric bypass when you have systemic vasculitis (churg strauss syndrome)?
If controlled. Yes, if the vasculitis is controlled.