I too had this problem with a severe pain in the bottom of the abdoman. It felt like my bladder was full, as if my stools were constipating me.
I know i had drunk mine water , eaten fish but could not relate to what the cause could have been. Also an indication was sores on my arms that were itchy, first like blisters, when popped were like infectious mosquitoe bites, when scabs pulled off a puss like substance came from it.
I thought i had a bladder infection and was constipated, used supositories, drank a anti-inflammotory for the bladder, then drank deworming tablets, still did not know what has fixed it but it has eased off after 4 days
please could you explain what it could be