I am trying to avoid losing 20 pounds or around 11% of my body weight in 1-2 months again. I didn't eat right during my last HIIT workout. How much and what should I eat if I would do HIIT 3 times a week?

Currently I weigh 134 lb, am 5 feet 6 inches, and have a body fat of 10%, I want to get it down to 8% without HIIT eating my muscles like last time.

PS

Does anyone know if a nice hot bath takes away your muscle soreness? I noticed that my extremely sore legs from last night's work out felt temporarily better after after a nice hot shower. So I'd think that a hot bath would work wonders.

Too much cardio, HITT or otherwise, will cause you to lose muscle mass. You need to find that happy median..

eat the same as you do before your weights routine.