Wow! That is a lot of tests! I have no clue what most of them are either.
Seems they have checked for pretty much every diagnosis I have come across googling. I understand that's really frustrating for you. Before I got my IBS diagnosis confirmed the psychologist I saw then said that you can't really learn to deal with things until you know what it is your dealing with. I think that is very true. I really hope they'll have some answers for you soon. In the mean time I'll keep my eyes open.