Mutaflor is great if you have a deficency of benefical e coli, I have extensive info at pptu.lefora.com on studies on this and how to culture it so you save $$$$.
Jarrow EPS is a great probiotic and reasonably priced
Anyone with Chronic-Fatigue-Syndrome who is also having GI problems should be tested by Metametrix GI Effects test (panel #2105). parasites were the major problem in me and will never come out using probiotics, cleansing etc. If somebody had told me about this years ago.... The test also checks for rogue bacteria and yeast/fungal issues.