I went to the Diet Doctor today and the nurse gave me my B12 shot i instantly tasted it, and now the site hurts realy bad, is swelled, and hot. I also keep getting pain in the spot it hurts all the time but every few seconds a pain shoots through it. Am i ok, what should i do. The first one she gave me 3 months ago got numb, but the next month it was ok, but this time its so much diffrent. What should i do?