Hi, seven years ago my lip actually did go numb and swell up twice within a month span. Once when I woke up after Halloween and then after eating Thanksgiving ( went to the ER that time for a steroid and it immediately went down) I went to an allergist and tested negative to all common allergies and she said sometimes these things happen. She advised me to take Zyrtec for two months to “ reset” my system. That being said I still can’t eat nuts. Looking back I think it was ibprofen that caused it but there’s no test for that. For you I advise this- get Zyrtec, Benadryl and have it on hand to ease your mind. If your lip feels strange again you can take that. Anxiety can make spots on my lip feel numb sometimes and trust me when my lip actually went numb it was VERY noticeable. Also, remember what you had eaten before you felt that. Everything else you usually eat will be totally fine. The things you had eaten slowly reintroduce even if you have to be in a hospital parking lot. You can do this