Hello, I have such a problem sometimes my daughter cries and gets fuss…

Hello, I have such a problem sometimes my daughter cries and gets fussy and can't fall asleep, everything is normal, clean diaper, she really wants to sleep but can't and she's already tired from rocking her, holding her in arms, she won't sleep, and when you rock her for a second she can get sick to her stomach, I understand that it's not good, but it's not always like this, what can be done in such cases? How do I take myself in hand, then I'm so sorry that I did that, and thoughts that I hope nothing bad will happen, so everything will be okay.