I would call your vet. He/she is going to need to see your snake again. None of us can diagnose over the internet. And not sure if the vet showed you how to do the injections by doing the first but you always want to point the needle up and flick it with your finger and push the air out before you inject. I had to give my 6.5' girl shots of Fortaz every other day for a month for a sinus infection and never encountered what you are talking about.
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