Yes, I too was forced in to an earlier menopause. I didn't really notice the loss of the periods until about two months out. Was so hard to tell what was what when radiation was making the tumor shed as well and then having surgery seven weeks after end of radiation and stress never helps in that equation either.
As for the night sweats, I believe that is more a symptom of the cancer itself. Yes, I absolutely get hot flashes, but not the same as when I had the night sweats and truly soaked in sweat from the waist up. The hot flashes started a few months after surgery, but honestly can't remember specifically when as I went on to chemo about seven weeks after my surgery.
As for the crying fits--no doubt the hormones are playing a part, but the diagnosis of cancer absolutely adds fuel to that fire. If it helps in any way, you are so not alone in how you are feeling--I can so totally say "been there done that".
Going in to early menopause had no impact on any of my treatments or surgery, etc. Just don't have to worry about getting my period unexpectedly, gotta love that! No more worrying about having it while on vacation, gotta love that!
Hope I could be of some reassurance!