clostridial infection
"I have had quite remarkable relief of severe bloating and sluggish bowel motility.  This had continued for three full months without relief. I was even begging for surgery to find out what was wrong.  My abdomen was so distended that my lung capacity (per spirometer) was 1/3 to 1/2 of normal, I got winded just climbing stairs at home and I could not sing (I'm a choir director). I could not sit upright in a chair or car and I felt about 10 1/2 months pregnant! 
I had been on antibiotics for several weeks before this problem started. Within 3 days of starting prescription strength lactobacillus, I was back to wearing most of my regular clothes, was able to do a full day of errands without stopping, and could sing again and dropped 6.5 pounds."