Foul smelling stool, slow bowel movements, and stomach bloating. SCARED

[BenMichael21]

I’m 22 years old and have had this problem for the last 4 years.  The reason for me posting this is because the symptoms have gotten worse over the last week.  My stomach bloating feels more intense and I’ve been burping like crazy(I’ve been eating a lot less due to because the burping occurs within a few minutes).  My stool sometimes smells like vomit and it normally takes 2-3 times the regular amount of time to poop(no difficulties with urine).  My younger brother developed similar problems a year ago(he couldn’t produce stool and developed fecal impaction except he didn’t get immediate belching like me), I’m just scared I have something worse like cancer because I’m waking up gasping and burping