Infant cries hysterically suddenly

My infant, 7 weeks old now, has cried hysterically three times already, within a span of 2 weeks. He is already fed, has his diaper changed and also burped, and his nose sprayed. We brought him to TCM massage to help with his gas and reflux, but he still cried like that. I don’t know what the issue is, and it makes me want to also cry whenever I see him like this. Usually he stops crying when we pick him up and rock him, and when I talk to him. But none of these worked the past 3 times. Has anyone’s baby behaved like that? I don’t think infants so young can have nightmares, correct me if I’m wrong. Does anyone know what’s happening? #advicepls #pleasehelp #FTM