I brought my cat 5 times over the year for the same issue. They kept on pushing for an in depth invesigation that would cost $$$$. I kept on saying it was probably irritable bowel syndrome. They kept on saying it wasn't, My cat was also pretty old, so it felt like they thought he was going to die anyway.
1000$+ later of pointless emotional vet visits, pain medication...I decided to go to a second opinion.
IT WAS IRRITABLE BOWEL SYNDROME and they gave my cat steroids that were 30$. Seriously avoid and find people who actually care.