are these symptoms of thyroid problems or something else?

recently ive been veryyy hungry and veryy thirsty all the time (therefore going to the bathroom often) and also for some reason, even though im eating a lot more…im loosing weight. when i had my period it was so light, basically nothing except for the first day. im tired all the time, taking naps constantly. i have an enlarged thyroid and they told me if i was having problems with my period i should see them again..but i dont know if this is a thyroid problem or something else. please help me!