Discomfort in throat causing sneezing especially after eating chocolate, bitter taste in mouth, and frequent need to clear throat /acid reflux or not?

Reflux more likely: You appear to have both acid and bile reflux which can really irritate and inflame your throat see GI doc.

Chocolate: It sounds more like you have a choclate allergy.See an allergist to get tested.

Acid reflux: If you are having acid reflux your doctor can order tests to see how often. A ph probe is placed and studied for24 hours. You can try over the counter medication. Ask your pharmacist. Try to stop caffeine and write down what makes it worse.