I feel like there is a lump or something stuck in my throat, trouble swallowing pain in left side of neck near throat, what could this be?

Sore throat : you either have allergies and lay on your left side at night or have reflux causing these issues. You can try Flonase over the counter. You also can try some imperator over the counter 20 mg twice a day with 150 mg of Zantac (ranitidine) at night.!!check the Internet for anti reflux diets and sheets. You can buy the book dropping acid by Jamie Kaufman which explains all you want to know about reflux.