What are the symtoms of thyroid disorder or a hormone imbalance?

i am 28 & i'm having some very weird symtoms.i sweat while i'm freezing (increaced perspiration),my periods last 2 days.i've been trying to have a baby,we've been trying for 3 yrs.could this be a hormone imbalance at my age,or could it be thyroid disorder,or stress and nerves.