I think food and water are going to my lungs?

Everytime I eat and drink I get worried, because sometimes I feel fluid in my lung but can still breathe fine. I hate eating now and I hate drinking now, I just wish I could live on an IV and be able to do other things that I want like make stuff or something. For about a week now it's been like this, I feel weak at times, my head hurts, my throat hurts, I have alot of mucus that comes up. I just don't know what this is and what to do...I am only 15 and so scared that I might die. I can't afford the doctor either and I just wanna cry so bad!!