Out Of The Blue, I Started Having Significantly Swollen Lips

Out of the blue, I started having significantly swollen lips and my throat, too. I've seen an allergist, gotten nowhere, except that I now am carrying around an EPIPEN. Regular fam. dr. had no ideas, either, qne ir' been like this for several months, off and on, no changes in meds. Any ideas? Tongue-tied in Tabernacle.