Annoyed and Exhausted

[AnitaAnswer]

I am 17 and am so exhausted with these strange symptoms. I have had this phlegm cough after every time i eat and has been getting progressively worse for maybe a bit over a year.
I remember feeling this strange cough appearing first after i drank a soda, so i stopped drinking soda. Up to that point i was drinking soda ALOT. This began a whole mess of things. I then began to have problem with dairy. Not coughing but digestive issues. THEN it became both the mucusy cough and the digestive issues with dairy. I went to the doctor for allergy tests and I am not allergic to ANYTHING, not even dairy. So now, I have that and that cough every time I eat anything. Anything at all. Anything I drink. I have also been having to what i just recently found out was heartburn.
Before I do anything I would like to know what anyone on here thinks.
Thank you(:

[AnitaAnswer]

Thank you so much for commenting! Haven't though it could be a valve. I've been looking into hiatal hernias but I think that would be way too crazy to be a possibility. I'm going to see my general practitioner within the next week hopefully and really looking for any answer.
Thank youuu, I hope more people comment with their suggestions (:

[LizKB]

Hi, it sounds like you are having lung problems when you eat (as well as digestion problems), so I would want to find out whether a bit of your food and drink is getting into your lungs. I had a relative who had that problem, because his swallowing "valve" wasn't perfect in getting fluids to go 100% into his stomach and 0% into his lungs. I suggest you go to a regular doctor / general practitioner / primary care doctor. Good luck!
LizKB