Please help 😭

Any advice would be great. My son is a little over 5 months old. All the sudden he's not napping as long as he used to, he is screaming BLOODY MURDER when he's awake, especially if I lay him back to try and go to sleep. He's being very finicky with his bottles, today he ate a 5oz bottle at 6am and I couldn't get him to eat anything else till he finally took a 4oz bottle at 1:30pm. He doesn't have a fever, im wondering if maybe it's teething? I have no idea but he's been like this the last 4 days and I feel helpless. Any ideas?? Even me holding him doesn't really settle him down.