How do I stop myself from getting overweight?

I'm 20, I have always had a hard time controlling my weight even though I am 5'6 147lbs, it goes up and down. I've been a 147lbs in years but 2 months ago I gained all my weight back after I was 130lbs. I like to eat and I have always kept my weight under control. But I have anxiety and I don't want it to get out of control. I have been reading lots of articles and all of them are about losing weight not maintaining it. So I don't know what to do.