I know many people who do this and IF you have the money and it's not going to break your bank, go for it! I just see people who are struggling and sick and think this is going to magically cure everything but that's most likely not the case. I see 99% of these tests say to go off G, D, E and a few others and add them back. Well that is an elimination diet which could be done very easily with a legal pad and a pen and find out the same things.
Even allergy testing for life threatening allergies is a 50/50 shot. Intolerance testing, if it was scientifically valid, would have even worse results I fear. These tests seem to lighten the pockets of those doing them and line the ones who suggest them. It makes me nervous for people. A lot of times these are people with things like Celiac but because a holistic practitioner told them to go off gluten they need to challenge to get an actual dx which is REALLY hard on a person. These are reasons I would suggest a strict elimination diet over any intolerance testing PERSONALLY.
I'm glad you are feeling better with what you found out and hope your trial go well when you reintroduce things.