My body is changing a lot? sweating+breakouts+ bigger waist +never ending hunger?

In the last two weeks I've been noticing a lot of changes in my body like a possible threat of a double chin. I'm also really hungry all the time like yesterday I had like an apple, a mandarin, gs and a banana in less than a 10 minutes and I was still hungry! I haven't really had any dietary changes except I'm trying to drink more water(due to the fear of a double chin). I had a huge break out like 2 pimples and one coming on my face, it's so horrible, I'm thirteen and I have had breakouts I only get like one pimple before my period usually and I'm no where near my period right now! And now I'm like sweating a lot! My shirts the last days have been drenched in sweat in the underarm area even though I'm doing the same amount of exercise! Also my waist is like been growing incredibly fast!