I had a cannula put in my wrist by a nurse in hospital in Spain, she blew the vein and i was bruised and swollen for 2 weeks. I tried to tell her that the vein in my arm (where she eventually got the cannula in ) was the best and has never failed. I think the language barrier was may have been to blame there though. As a nurse if a patient tells you where they have good veins you generally listen as it makes life so much easier for everyone.
Roxane, i hope the cream helps you start to feel better soon, you've had a rough time lately!