Losing patience

Hubby was away 3 days to JB and Singapore. I've to take care of 2 naughty. Kaitlyn is having ulcer on her lips, refuse to eat everything and very not behave. Yesterday morning, I losing my patience with her, and yelled at her very loudly. But on the way to work, I feel very guilty as she's just 4 yrs old child, why I treat her so badly. I remember she told me before, if she cry and being naughty, she ask me not to scold her but yet sayang sayang her by giving her a hug or carry her, then she'll be ok. I keep reminding myself, I need to control my temper when teaching my girls.