I know they do coexist and diagnosis between the two may be necessary. I have hypothyroidism, have for many years before I was diagnosed with OSA, or had symptoms of either disease. I didn't get the impression of a causal relationship between the two. I wish I could briefly sum up the report, but it's kind of complicated. Not bad reading though.
Keep us posted
Have you had the blood tests for a diagnosis? If not I urge you to do so.
I also have Bipolar depression which currently seems to be remitting a bit (or else I'm going into a manic phase).
In Rocks study-
"CONCLUSION:
In the OSA patients, the prevalence of newly diagnosed clinical hypothyroidism was low; however, subclinical hypothyroidism was common among patients with OSA."