I would suggest that you look at this
it contains good information about substances that increase or decrease the permeability of the gut.
I would also suggest that you look at getting some betaine HCL with pepsin (most of us have trouble making stomach acid)
For enzymes I use creon pancreolipase and Klaire Labs Sibb Zymes. Pancreolipase is a purified pancreatic extract that contains lipases, amylase and zymogens (inactive forms of proteases). Sibb Zymes is a collection of enzymes designed to duplicate the the work done by brush border enzymes (the ones teathered to your small intestine).
You will also probably need bile, I take ox bile.
When it comes to probiotics it is probably best to check out this site
https://cfsremission.com/.
Personally I did not do well with yeasts like S Boulardii.
I think that the work by the Melbourne group suggests that getting digestion right will be a precondition for getting the gut right.
You may also want to check out this site
http://www.badbugs.org/. I do not know how things are with your doctor, but I was able to convince my doctor to order the necessary pathology to do a PCR test for pathogens (I had b. hominis) and take the antibiotics listed on the site.
If this is a problem it would make sense to treat if before taking a lot of expensive probiotics.