Hello @cyclist22 and welcome to Mayo Clinic Connect. It is always nice to find someone else who can relate to what you are going through, isn't it? I am glad you are reaching out on Connect.

Here are some articles and excerpts that you might find helpful.

"Some types of thyroid disease that are associated with dry mouth include: Hashimoto's thyroiditis (HF): HF is an autoimmune condition that causes hypothyroidism due to decreased function of the thyroid gland. 2."
- How Thyroid Disease Causes Dry Mouth - Verywell Health:
https://www.verywellhealth.com/thyroid-disease-dry-mouth-3231729
"One of the most common causes of hypothyroidism is Hashimoto´s Thyroiditis (HT). Early detection of dry mouth is critical in preserving and..."
- Evaluation of Xerostomia and salivary flow rate in ... NCBI:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4765761/
Member @fighter shares the diagnosis of Hashimotos and also the dry mouth symptom and may be able to tell you more.

What, if anything, are you trying at the moment?