Aperson, if you think you have a parasites go to a doctor and have them do a stool test. Some would also be found in blood work. They have specific anit-parasite pills that work effectively and quickly.
Were working on an internal medicince doctor for you to go see, they are a little better usally then primary care ones for IBS.
IN IBS testing , 0-2% had parasites on top of having IBS. They don't cause IBS.
Its important to work on personal issues and will get to that soon also, they are very important.
I have had this since ten from post infectious IBS and am almost 50 now. You can get it when your young.
You should start all fibers at low doeses and some fibers don't help all IBSers and can created more gas and pain. They can also help some people. The acacia is something to ask Heather or others about, as I don't personally know much about that one.
It can take sometimes up to 8 weeks for your body to adjust to fibers, some a lot sooner and some it just bothers people.
Aperson, for you the biggest issue at the moment is to get you into see a good doctor to work with you.