Welcome in H.C.M.
I have gone through your query regarding swallowing difficulty, though your routine investigations reports are normal.
Considering your all symptoms and co-relating them with possible pathological process it appears as you are suffering from either of these-
(gastro esophageal reflex disease).
2- Grannular Pharyngitis
I would like to suggest you to do-
1- Steam inhalation.
3- Avoid spicy food.
4- Take proper rest.
5- Adequate fluid orally.
6- Anti histaminic.
I hope this above treatment will help you otherwise consult your ENT doctor.