Always get sick from injection

[MrRTTB]

Whey I've injected I get a little bit of feever or should I say fklue due to the swelling and soreness. Nothing much, just a little ehadache and a little more tired than usual. Stupid me injected too much into my left triceps yesturday. What would you recommend using as vitamins or other suppliements?
Would B12 be usefull(oral), b-vitamines, magnesium, calsium???