You are a true friend, Scott, and I'm privileged to lift up your friend.
Not that it will help, but a friend of mine in MT went thru something, that on the surface, seems parallel...and the docs there were baffled and he was headed toward a dirt nap.
Changing docs he came on one who had another idea and it turned out to be Beaver Fever...(Giardias SP?)...
Lyme is often un-diagnosed as well. I have several friends who found they tested FALSE negative saying they didn't have Lyme and did.
Hopefully, God will hear our prayers and bring someone in the medical community to an insight to help your friend, Ben.
Help him keep the SON in his eyes!