Normal
My hypothesis is simple,either a natural agent from a feeder which the body has a propensity to have an allergic reaction to. The other side,a bug/virus which its fighting off. One must take into consideration when ones body detects a foreign thing,one of the reactions to it is nausea vomiting fever etc. These are signs of the immune systems war against the foreign object. So I will strongly believe its possible,its like stabbing yourself with an epidermic needle which isn't sterile because that's all a fang is natural epidermic needle. As for allergic, the large proteins needed to cause an allergic reaction/Anaphylactic shock isn't or hasn't been found present so far in tarantula venom. So till its found,there is no data to prove otherwise. Where tests have been done with T venom,we will see what the future holds.