I feel so helpless. I need advice ladies.

My son is 13 months old. These last few days my son will start hysterically crying for no known reason. He will be playing and all of a sudden start crying so bad that he is red in the face and I have to hold him to calm him down. The second I put him back down he starts crying again and won’t stop at all until I hold him again. He is fed and has a clean diaper. He Also has water throughout the day. I don’t know if maybe he isn’t drinking enough or maybe he is going through a growth spurt. Maybe it’s separation anxiety. It’s breaking my heart hearing him cry like that. Everyone around me is telling me to let him cry and that he will eventually stop crying. He will cry non stop for 30 minutes until I pick him up. Everyone thinks I’m spoiling him. I feel so alone in this situation.