IBS or something else? Getting anxious.

Hi Dr, I wanted to enquire about my recent issue. I was having for the last 3 weeks. It started after I went on a high protein diet. I am a vegetarian so I included a lot of dairy products and due to some injury I also had to take naproxen so I attributed my symptoms to these two. I went to a gastroenterologist and he prescribe me symbulardi and Rifagut which I took for two weeks. I am better now. I’m not having loose tools like before but my stool type is fluctuating between being constipated and type 5-6. I will be booking an appointment with a local doctor here, but I just wanted to understand what this could be. I also had test with CRP,CBC and electrolyte which was all normal and only my ESR was raised at 30. During last week I was in goa and had pretty much everything without any major issues. Please advise what this could be. My appointment is on Monday and I am getting anxious.