How to lose weight?

I used to be 118lbs in October/November and since then my weights gone up to 126lbs.
I've gained 2 inches on my waist, 2 inches around my bum and 1.5 inches around my hips, and 1-2 inches around each thigh.
I don't know what's happening I eat healthy, I'm a hclf vegan. 
I'm so desperate to lose the weight thinking of taking laxatives. 
Now
December 15th