1200 calories isn’t enough if working out regularly. You also need rest days. Workout no more than 5 days and rest 2 days. I do Fitness Blender programs and they have 6th day as stretching only routine and 7th is rest. Their programs have HIIT and you’re only supposed to do that 2-3 times a week and not back to back days. If you’re doing full intensity every workout it might be too much. If you’re doing strength training, are you having rest days so you’re not over working the same muscles?
When I started working out I increased protein. Snacks are nuts, cottage cheese with fruit etc
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