S.R.
I wouldn't blame yourself too much. Motherhood (as wonderful as it is, is all about love and guilt). Night terrors are very common at many ages. My boys were the worst. Where does your baby sleep? Maybe being closer to you (in your own bed) would make him feel better. I know some people don't like to have their kids sleep with them, but if you don't mind, it sure makes for a happy baby.
Good luck.