Very enlarged lymph nodes in neck and upper back and collarbone and chest. why is it hard to swallow? feels like i have thick phlegm that wont go dwn

Pressure and swell: This can be related to a number of things but often the swelling is underneath where you actually can feel or see (like a glacier). If these have not gone done within one week go see a doctor. There are tests that need to be done. If you feel like you can't breath or have chest pain go to be evaluated urgently.

Need to see M.D: You need to see a doctor--this needs a good exam and blood work and chest xrays.