Coincidence? or allergy?

As I have asthma i got the swine flu jab. A few weeks ago I had it and got a burning sensation in the area. That night I got a huge temperature and sick countless times my tummy was so sore I couldn't eat. My head hurt so much that when I leant up I was all dizzy and was sick again.My mouth was full of ulcers. My mum didn't take me to A and E cuz the doc said he was going to come but he didn't. Do you think it was an allergic reaction? Or just a coincidence that i got sick on the night? thanks and sorry about sharing the bit about the sick that is quite disgusting i know =[