I would also try some probiotics:http://en.wikipedia.org/wiki/Probiotic
Flora is a good brand. This often helps with digestion, sometimes after a major stress the good bacteria can get depleted and have a hard time re-establishing. Lots of people are also having good results with holistic brands high in protien content/nutrients and that don't have fillers like corn, wheat gluten etc. Stuff that isn't that good for carnivores. I used to use Medi-cal and the specific one to help with crystals did seem to work for that but otherwise I didn't find it very good for overall health.