My TSH level is 15.6 and two months ago it was normal. It takes months to normalize but why has it elevated so quickly and what should be done?

You imply that you.. Are taking thyroxine therapy if so, quick rise may be that your 1. Taking it at same time as other meds 2. With food should be first thing in am 45 min before eating or other meds may have changed company making it use brand name synthroid took wrong dose.