That’s weird because five months ago you were “156ish pounds.” So, your plan to bulk went in the opposite direction.
Bogus. You choose not to take the time for breakfast. You find time to hit the gym six days a week, you can find 8 minutes in the morning to have scrambled eggs.
So, no breakfast, 200 calories for lunch, and you’re wondering why there’s a chance you’re losing size. C’mon, man.
At 5’10" and 150ish pounds, you did not have decent size. The problem is in your head. Don’t sweat it, happens to everyone at some point. Stick to the plan, don’t miss any meals or workouts for the next 16 weeks, and you’ll end up in a better place.
Unless you’re busy at sports practice, working a job, or hitting the books for college entrance exams, this can be easily fixed if you actually want to.