Hello @caseyn2020, Welcome to Connect. I see you were asking both @dalmdal and @khali if they have discovered what might be causing their internal tremors. I tagged them in my post in case they didn't see your question. I did find a couple articles discussing the connection of tremors with Hashimoto's Thyroiditis that may provide some answers for you.

-- Adverse Reactions, Hashimoto’s Thyroiditis, Gait, Balance and Tremors: http://www.hormonesmatter.com/adverse-reactions-hashimotos-thyroiditis-gait-balance-tremors/
-- What Is Hashimoto's Encephalopathy?: https://www.verywellhealth.com/hashimotos-encephalopathy-overview-3231700

Have you thought about seeking help at a major teaching hospital or health facility like Mayo Clinic?