Bowels problems. Cure for this?

I am a vegetarian, i eat fish during winter months. So in on 25th Jan i ate fried fish late night. Next day i felt my stools are not passing and felt discomfort. I had water and took isabgol. It got clear but at a slow pace. I didn't face any problem for 10 days. After this i had rajma and same thing happened again. I again had isabgol and duphalac syrup 10ml and it got clear again. Sometimes it happens with milk or maida or paneer, to be honest i am not able to track it. I do not have pain or any acidity. I just feel discomfort and pressure in my lower abdomen and when i pass stools i feel better. It's not that i am constipated completely. I pass stools everyday but sometimes i feel i need to pass more, like i am not satisfied. And when i am not able to pass stools properly i feel gassy whole day. I am not able to understand if this is constipation or IBS-c.. Should i take Normaxin rt? is there any permanent cure for this? it's affected my personal and social life. please help.