Extremely weird BM movements and stools.

Hey,

im a 17 year old male with extremely wierd bm and stools. my stools are thick and I do strain to have a bm. often after I have a normal bm, my stomach cramps do not go away untill I have a HUGE case of diarrhea which normally occurs 10 minutes after normal bm. its been happening really often and im getting paranoid. flatulence is now an issue for me and my stomach literally blows up like a balloon if i dont let the gas go. today I was straining slightly and had some really shredded looking stools come out. before these symptoms I have had blood in my stools and constipation, ill be seeing a gi doctor on thursday.

Has anyone experienced similar symptoms? perhaps it is IBS?