My son is a lot like this. He has silent reflux too and I think that was where it started. He is only eight months now but we have found ways of coping.
For us, the main things that helped, apart from getting suitable medicine, were:
Encouraging him to tolerate the things he didn't like for a few minutes longer each day, e.g. sitting in his rocking chair while I have a shower, tummy time, car seat, by singing songs he likes while he's doing them and then rewarding him by doing something he likes, such as holding him up over our heads, straight after.
Learning to carry him on my back in the woven wrap was a godsend. He is always quiet and relaxed in the wrap, and having him on my back allows me to get on with things.
Getting him to nap more in the daytime as his reflux would wake him frequently, so he wasn't asleep for the duration of the nap/night and was always tired, which made him more grumpy. Reflux wedges were useful for this too.
Changing nappy and clothes in a seated position rather than lying down as much as possible, often whilst singing, and letting him sit on a potty during nappy changes was a strange thing that helped. We started doing this at ten weeks by propping him against us when his acid problems gave him a bit of nappy rash and he suddenly seemed happier about changes altogether.
I know lots of people don't like them and I wouldn't have bought one myself but our neighbours gave us a babywalker that their grandson grew out of quickly as he walked so early and my son is so happy in it that I'm really pleased to have it. Otherwise he just wants to stand up and walk holding my hand all the time and gets cross when I can't help him.
I know it's hard but do focus on the good things too, like being a good eater and the determination to get up and walk so early. Perhaps the strength of his desire to get rid of the frustrations he feels will make him a passionate and dynamic person who achieves a lot in his life.