My Husband Is In Severe Pain,his Knees Are Up To

My husband is in severe pain,his knees are up to his chest,he's vomiting from the pain ,the last thing he ate were pistachio nuts,he's not allergic to them ,could there have been a bad nut' this has lasted about 2-3 hours already,he also ate a pear,he said there's a lot of air coming up,he also just told me he got stung by 2 bees ,head an arm could that be a reason