Sigh...... What a rough few months!

It has truly been a rough few months. Caleb has been in a "funk" that he just hasn't been able to snap out of. It started around Christmas and is continuing. He will appear to be in a good mood, but then out of the blue he's crying or angry. At school he's hitting the teacher's, but for me at home he rarely gets so out of line. I'm a bit at a loss of what to do. Homeopathy hasn't helped as of yet, and now I'm pulling out the supps, revisiting old stuff. Anyone have any ideas? Today was the second day in a row that I've brought him home due to hitting a teacher.