Dry eyes, dry mouth, daytime sleepiness.

(This has been translated using Google Translate, so there may be some grammatical errors.)

Well, I have had a dry mouth and eyes for more than two and a half months now, the first suspicion I had was that maybe I could have an autoimmune disease such as Sjogren's syndrome or maybe some type of diabetes, the fact is that I went to the doctor for those symptoms that I had in addition to excessive sleepiness during the day (which I still have) and she asked me for a blood and urine test, which I did and took it to her, in itself everything was relatively well; glycosinated hemoglobin levels, tsh levels, cholesterol, insulin, etc. Everything except my uric acid level, which was quite high (9 something) which would be hyperuricemia, she prescribed allopurinol for 3 months and told me that my dry mouth and eyes could have been caused by my high levels of uric acid. The thing is, I actually searched through many internet sites to see if high uric acid levels were somehow related to dry mouth and found nothing (I'm talking pretty trustworthy medical sites). So I would like a professional to solve this doubt for me, so as not to be taking my daily medication for 3 months when my dry mouth could be something else. Thanks in advance.