Baby screaming all day when awake

Help!! Anyone else noticed their baby is constantly crying, frowning and never seems happy? Mine is 6 week old. The last two days he has been terribly unsettled. It can’t be colic as he is not drawing knees to tummy, brings wind up brilliantly. He does have gaviscon for silent reflux and is on probiotics. I just don’t know what’s wrong. I’ve heard crying peeks between 6-8 weeks?