Re: Unexplained swollen lip and tongue...HELP!
We can't help you diagnose here -- only do research on a diagnosis you already have.
Your best bet is to get yourself to your family physician, then and tell him/her exactly what you've just told us.
You can help by keeping track of exactly what you've ingested, perhaps 24 hours before you have the swelling. When you get the swelling again, think back to the last day or so and write it down. Continue to do that. You might be very surprised at what you find.
Once you have a diagnosis, learn everything you can about it. You can use some of the starter websites in the sticky at the top of this board.