Why am I having pharynx dryness for the past five months?

Hello doctor,

I am 33 years old, 5.91 ft, 182.98 pounds. I am suffering from non-stop pharynx dryness (right behind the tongue) for past five months. I am drinking a lot of water, doing salt gargle, took GERD medication for one month, been tested for Sjögren syndrome. Nothing helped. I have noticed that air coming from AC, ventilator or wind increase the problem. I have also been ill already five times this year (pharyngitis with or without fever, up to 104 farenheit) and I think it is related to my throat weakness. The doctors have no idea and I do not know what to do, at least to relieve my symptoms. I have tried a lot of OTC medicines such as Propolis spray, capsules, etc., but nothing helps.

Thank you doctor,

I also forgot to mention that I have been given Desloratadine once a day for three weeks now, but it does not seem to help. Does it mean I have no allergy? I have already done some blood tests you can find below.

Thank you doctor,

Is this what you mean by Chlorhexidine gargle?

Thank you doctor,

I will give it a try. In how many days should I see the improvement?

Thank you doctor,

It is written that the usual treatment time is seven days. If symptoms persist beyond five days, the need for further treatment should be assessed by the physician or dentist. Is it true?