What can I do for a sudden swollen bottom lip?

I just returned from the grocery store. My lip started to tingle and
feel numb. By the time I got home, it was starting to swell. I took
Benadryl and put ice on it. Any other suggestions? It is only the
right half of my bottom lip. I wonder if I touched something at the grocery store and transfered it to my lip somehow. I have not eaten anything unusual today.