Ultravist and spent hours

Unfortunately I experienced extravasation of my Ultravist dose, causing extreme pain in my forearm, spasm of my fingers on the arm that it was injected into, followed over the next two hours by increasing swelling of the whole arm and patchy red discolouration of the skin.
My normal diameter of my arm is 18cm below the elbow, and it swelled to 24cm, to the point that I was unable to bend my elbow, and the swelling in my wrist began to act like a torniquet around my wrist, causing my hand go blue from restricted blood flow.

I spent hours massaging my arm towards my armpit, and applying heat, I took an antihistamine, and a diuretic, in a somewhat panic state of what could happen long term to my arm, as none of the medical staff had any idea.

The swelling slowly subsided over the following 5 days, and I appear to have no long term complications.