IBS does not cause a sore throat, but acid reflux can.
This happens when the acid trickles up to the pharynx and irritates at night when you are laying down flat on the bed.
Most people with a persistent sore throat and a lump in the throat feeling suffer from silent reflux. Acid reflux is particularly worse during periods of stress.
I will suggest that you start on salt water gargles thrice a day.
Sleep with a head-up tilt of about 30 degrees at night and avoid eating spicy, salted, smoked, and barbecued foods after 6 PM.
You should also take an antacid like Mylanta or Gaviscon, an hour after your meal to reduce the production of acid in the stomach.
These measures should help.
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