Wakeful Baby

Has anyone ever had to live with a baby that won't stay asleep all night? Our baby right now is a monster at night time. We go through bedtime routine, he falls asleep in arms usually very quickly, we put him in his bed and leave him well covered. Usually at least twice he wakes up through the night. We have wondered if his peepee stings his skin and is uncomfortable when he is wet, so we consistently change him and usually put him right back to bed. Sometimes he falls back asleep quickly, sometimes he screams for however long we let him scream. The problem is, all three kiddos are in the same room. So if we let him bellow for more than thirty minutes, Nathan and Timothy wake up, then it's all three of them bellowing. So we really can't do what we did with the other two and let him just cry til he falls asleep, but unfortunately, he may not be learning to fall asleep by himself--you know, how to comfort himself back to sleep. We never (or very rarely) take him into bed with us. I have occcasionally, when hubby is doing overnight shift, if I can't get him back to sleep, or if he is sick, or can't seem to get warmed up. But I try to get him back into his own bed as soon as possible. We don't do co-sleeping. We only have a queen-sized bed, and both of us are somewhat violent sleepers. We would either never get sleep ourselves, or squash the baby...neither are good options.
Any suggestions?? We also will need the crib for new one before too long, so the toddler bed will be coming out of the attic for Keith soon, maybe that will help.
AHHHHHHHHHHHHHHHHHHHH!!!!!!!!!