Just thought I'd give y'all an update. DH had given up on testing. Nothing would budge him, so I gave up too.
Our neighbors host a prayer group every Thursday. We weren't members, but they had offered to and prayed over DH a couple times, but he was still getting worse. Then our neighbors prayed over him one evening and his seizures went from the same amount he'd have in one day - he'd have in a week. So the seizures were way down But he was still aspirating and that part was getting much worse.
Well, the neighbors pastor was over one night and he and his wife along with our neighbors prayed over him and......completely healed. Never had a seizure or choked after that.
DH continued to pray and things that had plagued him for years, like his leg giving out/tripping, pain in his knees, pain in his wrist (he couldn't even do pushups anymore) - just gone.
We're thrilled and give complete credit to God. DH says that of all the things gone, he's most thankful for being rid of the pain. It's the first time since I've known him that he's been pain free. I'll leave this thread with a yay, God!
And a big thank you to everyone who's been so helpful - I honestly don't know how I would have gotten through this without the help of y'all.

I debated whether to post the update - I mean it's not something you hear about everyday, but DH is the one who prompted me to tell y'all what happened.
Prayers continue for all in need.

Love you guys! Thank you!