HI---sounds familiar. Yes, if you have not been checked, a trip to the doctor is likely a good idea. I was having similar symptoms and chalked it up to my IBS(Irritable bowel syndrome). Turned out I needed to have my gall bladder out. Did fine with that. And like you, I was glad not to eat and had lost some much needed pounds. NOW have appetite back and got to re lose some of them! ( I sometimes joke that I want my gall bladder back so I will not have an appetite!)
But seriously, you should go to rule out gall bladder, ulcer or reflux, etc. Might be things to do that would help.
As far as the sweats that sounds more like peri or menopause .
Good luck ....I was queasy all the time for ages and it is no fun, a miserable way to lose weight. Hope you feel better soon .