Hi. My DH has vasculitis.
It started as a rash on his feet. After a year it was getting worse and he saw the GP who said it was self-limiting and would go away. A year later he saw another GP (it was on his thighs by then) who said it was like a childhood vasculitis - that can affect the kidneys and liver and that it was usually self limiting. He asked to see a dermatologist who did a biopsy which confirmed vasculitis and she gave him a course of prednisolone and some cream. He started to get numbness and tingling in his feet and was sent to a neurologist who did nerve tests and told him to come back the next year.
All was well for a while, the rash improved. One day he got really bad nerve pain in his arm and his hand went numb. There were red patches on his hand so I assumed vasculitis. The GP gave him some prednisolone and said it could be MS and he saw the dermatologist who said everything was going ok and it wasn't anything to do with the vasculitis as the sort of vasculitis didn't cause nerve damage.
Fortunately, he had an appointment with the neurologist who sent him for another nerve test and booked him in for a nerve biopsy and a lumber puncture and an op on the nerve in his arm.
She, however, wasn't convinced by the dermatologist and got the nerve conduction and biopsy done asap which confirmed vasculitis damage to the nerves and he then saw the Rheumatologist who put him on a large dose of prednisolone with stuff to combat the side effects. This was tapered off, immunosuppressants started, increased, and now he is at the end of decreasing these - nearly off them! Lots of blood tests and check ups.
The rheumatologist is, very fortunately, a vasculitis specialist. He says that not all vasculitis can be classified into the named ones. His does not show up on blood tests which means they have to be very careful and keep an eye on symptoms.
The nerve damage seems to have mended too 
The treatment has not been too bad (we were originally expecting an chemo drug that makes you lose your hair
)
The worst bit was trying to get a diagnosis, and the nerve pain.