My thyroid level is 13.21 h my B12 is 1793 h I have a ovarian cyst. Can this all be related?

Thyroid disease. Any thyroid abnormality, whether excessive thyroid hormone or less than normal can affect a woman's menstrual cycle, but either does not generally cause ovarian cysts. Your B12 level will not cause an ovarian cyst. Ovarian cysts are spontaneous, and at 56, may require surgery to diagnose the cause. See your physician for advice soon.