Anyone else with digestive issues/ functional dyspepsia?

I developed hashitoxicosis this summer. But starting last summer I got really bad FD. Everything was ruled out including SIBO. Interestingly this was around the time my TSH started to slowly decrease. I get bloodwork done every month for another issue. My TSH went from 3 to 0,6 in a year and my FD got increasingly worse too. When I was in hashitoxicosis I barely could eat. My TSH went from the 0,6 to not measurable within 3 weeks and my stomach issues became severe. Everything gave me pain and made me belch. Now that my thyroid is more stable I feel much better. I can’t help but wonder how those two things are related.

Also when I was overmedicated on thiamazol (for like 2 weeks) my FD was completely gone. My TSH was like 15 and I was a bit fatigued but my stomach issues were so much better lmao.