It is a shame that doctors will call symptoms that they don't know about and put them under the umbrella of IBS and tell people that they will have to live with the problem. I know someone very well who has encountered much of what you described; I really empathize with you both.
The only difference is that this person has given up and is doing more damage by taking a ton of meds. They refuse to believe that various parasites could possibly be a problem.