Hi Kaitie,
I've had to have impressions done too, with the same result as you, and probably everyone else for that matter. The easiest solution is to bring Chloraseptic Throat Spray with you, if your dentist doesn't provide it for you, and spray the back of your throat 5 times right before the impressions are put in your mouth. Do this before both the upper and lowers are done and you will have no problem at all. It numbs the back of your throat, so there is no gag reflex. It works, I've done it. So, no fear there. It's really bad allergy season here right now and I keep the throat spray by my bed, so when I have post nasal issues, I spray my throat and it stops the choking. The cherry flavor tastes the best. I hope this post won't get deleted, because I mentioned a product. If it does, I'll try to re post it just as sore throat spray.
I've been in forced exposure also. My daughter was in the hospital and I had to park in a parking garage, take elevators and stay in a closet sized room with her, every day for a week. I had to do it. Just counteract all negative statements in your head with positive truths for apprehension leading up to the appointment, for sitting in the waiting room, and while you're having the work done. Can you wear headphones and listen to music while you're in the chair? Tell yourself, you'll feel much better and have no pain afterward, so that actually doing it seems less stressful than it would be to continue in pain. I also pray and it always works. God's Grace falls on you when you need it the most. I have found that to be true, having had several dental procedures. You can do this. It's a temporary uncomfortable feeling, but try to keep your mind on pleasant thoughts. I try not to think about the procedure until I'm actually in the chair. It used to be difficult to do that, but now, with practice, I am able to not think about it until the time comes. I know you can do this and I know it is difficult, but I think you're going to surprise yourself and it won't be as bad as you think. I will pray for you too. Look forward to hearing how it goes.
Your Friend, Shari