I understand the reason for your concerns.
is a hormone in our body which acts on almost all the cells in the body and is needed by all. Any derangement in its functioning or production will certainly involve many organs and female sexual organs are no exception. Your irregular menstruation
can certainly be due to your graves disease. However one has to be cautious that there could be an independent reason for your excessive and irregular menses which could be different from your thyroid problems. I think there is nothing wrong in getting a repeat USG and also a hormonal
profile to satisfy our concerns. You feeling depressed will add up to your trouble. May be you can engage yourself in some hobby or exercise.
Thanks and regards,
Hope I am able to solve your query,
Have a nice day.