Hello, I Am A Mature Aged Woman Living In Outback

Hello, I am a mature aged woman living in outback australia, yesterday we were mowing grass, in the evening I noticed round welts appear under arms top of legs and gradually some on my stomach, not itchy.
We do have an influx of horse flys (March flys) at present and I have a bite on my right hand which is very swollen. During the night my top lip has swollen up and also my tongue. On Thursday 12th my husband and I both had our injections for going to Vietnam, Typhoid, Hep A & B, and I also had a pneumonia shot.
He has had no reaction, could this be a reaction?