The Pass 4 Days I Have Been Experiencing Excessing Burping

The pass 4 days I have been experiencing excessing burping and bloating. After several days of a congested test, I bought some Mucinex. Ever since with every drink ow water, vitamin water, tea, I burp. It is also causing difficulty swallowing and excessive blotting. I have tried to eat, soup, mash potatoes, applesauce etc,but can only eat about 1/10 a normal portion before getting bloating. When I drink to wash it down, a burp. If I don't drink but take a break from eating and get up, I get the need to burp. I had an endoscopy 18 months ago when food got stuck in lower stomach and it stared from chocking up food during burping.