Welcome to healthcare magic.
From your history and description, it seems to me that the swollen vein on your wrist could be a sign of acute thrombophlebitis
, an inflammation of the veins. Your backache has been there for a long time now. It seems unrelated to the current episode. However, if you have other joint pains
, recurrent episodes of thrombophlebitis, headache, dizziness
, it is better to rule out an underlying collagen
vascular disorder which can rarely present this way.
Hope this clears your doubt.