Anna, I have a history of migraines which first started at age 41. At one point they were so severe I was hospitalized twice in the same month. I have had all of the classic migraine symptoms especially severe nausea. I have also had the feeling of a loss for words, confusion, and my tongue not working properly. Although I don't recall swelling when this happened.
I still get these moments of a loss for words and confusion. As well as migraines. But rarely now. I stopped taking certain meds which aggravated this symptom. It is a really scary feeling, like you are losing your brain.
I did have severe facial and lip swelling (moderate tongue swelling) three times and each time it was hives, there is something I am allergic to in August or September or it could have been fake tanner. When I had hives, I had no confusion/loss for words, just a lot of swelling.
So you're not alone in having migraines or these symptoms. I appreciate your sharing this information, and I hope you are OK!