Hello everyone Girls, please give me some advice My daughter is 5 mont…

Hello everyone Girls, please give me some advice My daughter is 5 months old, there are moments when she gets very fussy and doesn't sleep, her eyes itch, you can see she wants to sleep, and this continues for 2-3 hours straight, and sometimes it's not exactly hard hitting on the foot or pinching, or shaking, not with all my might, but noticeable for the child, like how I feel bad afterwards, every time I promise myself that I won't do it anymore, I write this with tears, please advise, I take magnesium, it doesn't help