I had an IV in for 2 days and after leaving hospital I can't straighten my arm from where the IV was put in. I was given antibiotics, anti-nausea meds?

Vein irritation. The vein may be irritated/inflamed from the iv needle or the infusions. If there is surrounding redness,tenderness or hardness of the vein,or arm or hand swelling, have your physician evaluate you for diagnosis and treatment. In the meantime,apply warm packs to help the inflammation subside.