Any Health Care Professionals Here?

Every time I’m stressed, I get this painful stomach pain where I get bloated, gassy and nauseous. I’ve been to three doctors, who took my blood test and all said “I’m normal” but I literally am not okay. I can’t sleep at night because I’m so nauseous, and I keep burping or passing gas. I would sit in the washroom crying because I just want to rip my guts out to stop hurting... Usually.. these symptoms won’t go away until for example.. I finished my exam, or all the things I was supposed to do.

Could I possible have IBS or do you think it would be anxiety-related?? I’m so frustrated and I have been feeling this way for 20 days now.