This is so common! My DD did the exact same thing from 6 weeks to 12 weeks. It's just a phase that many babies apparently go through and can be completely exhausting. The things I did at the time that seemed to help a bit was to have her in a "colic hold" belly down in the crook of my arm. And sometimes letting her suck on a dummy just for comfort at that time of day helped. I never gave her a dummy to sleep and didn't use it past this phase. In retrospect I think I fed her too much on those awful unsettled evenings. I don't think it made it worse but I don't think it helped either. At the end of the day there's not much you can do - so don't worry, you're doing a great job just being there for him!