Suggest Treatment For Angioedema

I have been experiencing episodes of angioedema for 20 yrs--ever since I was stung by 9 bees. These episodes have been very scary as I usually end up in the ER with swollen lips.,tongue ,neck etc. They also seem to travel "inside " my body making me feel sick. I never know when this will happen ,so I feel so anxious whenever I travel and just last week had to cancel a trip to Ireland--the Drs don't know what to do with me and I am so frustrated. I just want to feel better