To begin with, please don’t dose yourself with Beta Blockers. Get some sort of medical advice. Your blood pressure is SUPPOSED to go down with them. When I was on them regularly, my BP stayed around 90/50 and I was fine. As for the lump, make an appointment with your Endo and refuse to leave until he/she looks into the problem with your neck. If you are not satisfied, then call another and ask for a second opinion appointment. It is really not anything to mess with if you already have Grave’s. And as for the time limit, I had RAI on Sep 6 and my thyroid didn’t crash until the end of January. Every one of us is different, and we all react in a different way at different time rates.
Please, for your sake as well as those of us who care what happens to you, don’t self medicate or dose yourself. With Grave’s, you don’t react the same as people who don’t have it and it could be very dangerous.