I'm always having constipation and i feel full very fast.my lower abdomen feels bloated and i'm always burping. sometimes feel breathless too . why?

Insuff Information: I do not know UR age or UR med problems. I do not know what meds U take. If you are bloated from stool there is stool softener(Docusate Sodium). To clear stool quickly Milk of Magnesia (magnesium hydroxide) 2oz or 4 Tble spoons with 12 oz of water should clean U out in 6-12 hrs. I do not know enough about U to suggest anything else. U should see an internist and get a complete Physical and Blood tests as soon as poss.