@bpleban - I’m sorry your son is having these issues! Migraines are terrible and then to lose Dexcom alongside it is crazy making. As you can see below, I had a similar issue with D5 and injectable Imitrex. Does your son have D5 or D6? I’m now on D6 and have not had problems with using injectable or oral imitrex (although I do not fingerstick often so haven’t really tested for accuracy…).
Is he taking anything with acetaminophen (e.g., Fioricet)? I found out the hard way that D6 is not immune to acetaminophen; just able to deal with it at standard doses. When you’re taking higher than the recommended dose, it can cause wacky D6 readings.
Please keep us posted and I will post here or message you if I think of anything else. Also feel free to PM me any questions about migraines. Unfortunately, I’m way too well versed in that world as well. Sending good thoughts your way - Jessica