Hi
I have been on varying doses of prednisolone for over 23 years and like Jenni have experienced various problems along the way. When I was first diagnosed steroid was the "in" treatment and consequently now I cannot do without them (although I'm on a bucketload of other stuff!) because my adrenal glands do not produce their own. Once I cut down below about 5mg I start to suffer light headedness, muscle weakness and low blood pressure. From what I understand this can take a long time to happen and certainly 3 years, although a long time, shouldn't be too problematical.
I too have had an episode of vasculitis but in my arms and hands. The treatment was high dose prednisolone. It was several years ago and has never recurred. I don't know whether other treatments have been introduced more recently.
I am surprised you are taking steroids as these days they tend to be reserved for emergency use. Have you been considered for anti-tnf as you seem to have had problems with DMARDS?
Lyn