People react differently to the venom; I remember reading one account where a keeper came close to losing his finger. It's almost like a bee sting - for some people it's a quick 'Ouch', while others end up in anaphylactic shock.
In the future I'd suggest using a small hook to dig your hoggy out for feeding, if you think it's really needed. For mine I just leave the warmed, thawed feeder on top of a hide and it's usually gone an hour later.