I have had kind of IBS for some time. When I get up in morning, I go to toilet and everything is fine. Later I get urge to go again to open bowels. If I do that then fo another 2 hours I get burning feeling and want to go pass water again and again. I feel this is brought on when I eat citrus fruit.
I must mention that seriously abused citrus fruit for about 2 decades. I used to overdose on clementines (small oranges) and mangoes.