Collic? Reflux?

I am having a moment. a moment of quiet - Cooper just went to sleep, and jackson has been in bed for a while. I am exhausted and should be in bed too, but its so hard to go to sleep at 9 pm. the longest cooper ever sleeps is 3 hours, and that is usually just once a night. as the night goes on, he sleeps worse and worse. After he nurses he burps and goes peacefully back to sleep. However, after we put him back in the pack&play he will start grunting after about 10 minutes --- just as we are slipping into la-la land. So, then you have to pick him up and hope he burps. If he does, he usually relaxs and gives up the grunting. but, sometimes he doesn't burp, so you put him back down after trying, and then he begins to grunt again. I just don't get it. He will only sleep for about 30 minutes during the day before he wakes up. He wakes up grumpy and I usually can't get him to go bak to sleep because he just roots and cries. On the weekend we are more successful because Colin is here, and one of us can entertain Jackson. It's so frustrating during the week because Cooper is finally asleep, and Jackson and I get all bundled up to go play in the back yard, and then cooper wakes up and we have to go in. I prayed that Cooper would he be easy to burp, and that he would nurse quickly. Both of which he does. He almost always instantly burps after he nurses, an it only takes a few minutes for him to eat. He's quite efficient. I can'tsay the same for Jackson. He usually took around 40 minutes from start to finish nursing, and would NEVER let out a burp easily. The issue with Cooper is that he burps really good, but needs to do so 3, 4, maybe even more before he can sleep well. And he spits up quite a bit. It's not unusual for me to nurse him every 2 hours for most of the day, and I thnik most of the reason why is because his little tummy or throat is hurting from all the spit up and burping. I can't be sure, but after the last week with many screaming fits I know something is bothering him. On Friday, from 2 pm - 6 pm I held him. .. either walking him, rocking him, nursing hime (3 times in that period because he was so hysterical it was the only thing to calm him). Only 20 minutes out of the 4 hours did he sleep. so, I think we are going to try and talk to our doctor on Monday. we might try out the Zantac and see if that helps. I just wish he could have some restful sleep (and me too of course). The biggest problem is that during the day I have to hold him so much and keep going back in his room while he naps to burp him, that Jackson just gets the short end of the stick.
Anyway, please say a little prayer that Coop works this out. I hope he will just outgrow it, or that the medicine will help. I need prayers for patience though. After an hour or so of that screaming and crying where I can't console him, I feel like crying myself. It is overwhelming and exhausting.
I can barely keep my eyes open - better go to bed.