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removal) does cause symptoms such as abdominal fullness, bloating
and other GI symptoms. You have not mentioned what symptoms you have now. If your symptoms match any of the GI symptoms, perhaps they are not related to your thyroid hormones.
Moreover, your thyroid hormones are in normal limits and increasing medications are not required.
Perhaps consulting your surgeon is in order. He/she can make prescribe other medications to ease you.
Hope this answers your query.