My throat has been hurting for about 5 days and at first I thought it was a cold. It comes and goes but hurts more when I lie down. What can I do?

Reflux. Reflux or GERD can cause a water brash like sore/scratchy throat aggravated by lying down and with certain foods and also cause increased burping and gas. If you have already gotten checked out for strep throat, reflux is a possibility. Another possibility is post nasal drip from seasonal allergies. .