Hello and welcome to justanswer.com. I am pleased to assist you. sharp pains, soreness, and burning, and belching sound like acid reflux. There are over the counter medications such as zantac (ranitidine in generic) that work to take away the acidity of the gastric juice that caused pain and erosion when it flows up into the esophagus and throat. Symptoms may be worse when laying down (easy back flow), so pillows are useful and sitting up in the couch instead of laying down when watching TV, etc.
I do hope I have been helpful. I wish you all the best. It has been my pleasure.
Is there anything else? If not, please accept this answer.
In the mean time, would you suggest gargling with salt water ... or will that just make things worse?