It would have helped had you told me if your entire thyroid
was removed or only half. Since it was cancerous it is more likely that the whole thyroid was removed. Normally, after removing the thyroid for cancer, a thyroid scan is done 6 weeks later to confirm that the entire cancer has been removed and if any is remaining to destroy it with medicines. It is only after this scan that Tab Thyroxine
is started (the thyroid hormone that you will have to take for life) and the dose is titrated over a period of months to make the TSH
normal. If you have not been given thyroxine because you are scheduled for a scan then the spotty periods and high TSH are normal as they are both features of a subnormal thyroid state. They are not related to your cancer and nothing to worry about. If you are not scheduled for a scan, talk to your doctor and get one. If you are already on thyroxine and the scan has been done, then the dose needs to be increased.