Can having hives make an allergic reaction worse?

Im a 23 yr old female. For the last 15 years I have suffered from stress hives. Not only to i breakout in hives if im nervous, excited, embarrassed or mad, but also when I get hot. my body releases histamines when I feel the lest bit of stress or heat. I found out last year that im allergic to fire ants after my face, neck, tongue and throat swell up. I just recently got bit again and was taken to the ER. When im bitten by a fire ant my body releases histamines and blah blah blah so I swell up. My question is since I already produce too many histamines does that make it worse when I am bitten by a fire ant? Is that why it gets so bad? And does this mean that i am probably allergic to most insects that sting?