L.K.
I would definitely keep your appointment and get a professional opinion on all of this you are going through. I know with my second baby (they are 15 years apart) I cried and cried for silly reasons and when I look back I do think it was exhaustion as well as all the crazy hormonal changes my body was going through.
Your doctor can probably recommend a different sleep aid as well if they think it would be better than what you are taking.
I wish you lots of luck and strength.