Bloating after meal. Day. please help.

My stomach is getting bloated after a meal from the last 3 weeks. I have not changed any diet. Feeling very uncomfortable after 20 - 30 Min of having a meal as stomach becomes heavy and bloated. Another noted change is that normally I go to toilet in the morning straight after I wake up and only once a day. But now for the past few weeks, I go twice in the morning & one time in the afternoon/night. Morning time though goes twice everything seems to go as normal but during the evening time the stool seems to get a bit harder. No changes in diet or life style has been there, so not sure why this is happening suddenly. After a meal once get bloated it says for long period of time, may b the whole day. Please help.