If it's reflux, I sleep propped up on two pillows. I'll wake up without any irritation. Also, try to eat smaller meals and not so close to bed time as well.
It could be from vomiting so much as well. Magnesium oil applied like lotion helps with nausea and sea bands are also keeping me from vomiting as of yesterday. My nausea went overdrive since yesterday :(
I had a severe sinus infection that also gave me that feeling. Nasal rinse, flip turn nasal rinse cleared that up.
Not sure what other symptoms you have as you said you've been sick so can't say much else.
Hope you feel better.
I get this to all the time after eating it's horrible ask if you can take Zantac for heartburn and reflux my doctor allows it
Make sure you eat small meals, do not lay down for 30 min after eating. If you could wait up to an hour, that's better. Stay away from tomato based products, chocolate, and acidic foods. It really is the reflux. Do not drink with meals, wait til after to drink anything.