Kathy, I'm sorry. Are you having a return of worse MG symptoms too? I know that for some people, the DV only gets better on Pred. Can you leave the driving up to your husband on vacation and actually rest while gone?
Some people see double vision as a nuisance they can live with (except when it makes you unable to drive!). But it can also be a sign that your MG is getting worse. You've already answered your own question: Call your neuro!
Annie