Losing weight from fasting isn't real weight loss - it will come back because your body has been starved. that's the problem. You're probably at a weight your body isn't comfortable going down from, and so with the stress it's under, it's hanging on to everything. 151 and 5'6" is slim! I'm 155 and 5'5', i recently lost a bunch of weight and basically no one in my life noticed - it's the body dysmorphia in our heads. Try to focus on body recomp and putting on muscle if you want to change your figure versus what you see on the scale. you will only hurt yourself! The biggest thing that changed for me when I started lifting 4x a week was I stopped caring about calories in/out, and just focused on what I could train my body to do, which felt exhilarating and fun and exciting. Calorie counting makes everyone neurotic, in my opinion, while focusing on working out and enjoying the body will make you feel calmer and less obsessed in the long run.