I've never been allergic to any medications. Within 30 minutes o...

I've never been allergic to any medications. Within 30 minutes of taking this pill, a huge bubble formed in my mouth on the inside of my lip, I started sneezing like crazy, my throat was itching and my skin was very tingly. I called my pharmacist, he instructed me to take Benadryl. I did and about an hour later the effects had subsided with the exception of my skin still feeling a little strange. This was very scary to me! Today I was telling my m-i-l about it because she too had an allergic reaction to a medication about 3 weeks ago and come to find out - the medicine she reacted to was Avelox! Her reaction was SEVERE, requiring an overnight stay in the hospital. She couldn't breathe and passed out. This seems like a drug that is way too dangerous to be on the market. I've never reacted like this to anything and my mother-in-law almost DIED because of it. What is going on?!