As a mum of three refluxers that hasn't had a decent night of sleep in 5+ years, I understand how sleep deprivation can affect your day to day life. So here's what I do and have done in no particular order.
Get the reflux under control. All of these NWs lead me to believe that his reflux is not under control. My guess is that he's crying because he's in pain. Allowing a reflux baby (or any baby) to cry can really just make this worse. He's getting all worked up from crying and inevitably going to reflux more. Reflux meds can take up to 2 full weeks to work and even longer to heal the damage to the esophagus. I would consider giving Prevacid another shot and time to work. Are you eliminating anything from your diet?
As far as your DS1...try to make some time during the day to do something fun with him. Even if it's just 10 minutes while DH tends to the baby, it's well worth it. He needs to feel important too. This time around I had to deal with a 4 year old, a 2 year old, and a newborn that was in the NICU and had other medical issues and reflux. What did I do? I tried my best to meet the needs of all of them. Sure, it wasn't perfect or ideal, but each day it got better. I would also really consider looking for a babysitter. (I know you said you're looking for one). I have a few teenagers in our development that would come over and play with the boys while I tended to DD or if she was sleeping I could get some things done. Well worth the money!
Marriage...IMO, a good baby can even test a marriage. A reflux baby can REALLY test a marriage. DD is a year old tomorrow and DH and I just went out on our first date night on Friday. It's hard, I really get that. What we did was try to do little things together...watch a show together, head up to bed as soon as the kids were asleep and just talk, go for walks with the kids & talk, etc. It wasn't much, but it did go a long way in helping us stay close. As you kids get older it will be easier to do things with DH again.
Sleep deprivation- surprisingly enough I think I've just gotten used to it. On the days/nights I was at the end of my rope, I just kept thinking that my poor DS/DD didn't want to be up all night screaming, fussing during the day, etc. It was up to me to help make things better. I sort of took it as a challenge and boy let me tell you it was, especially with DS2! That being said, you have to take care of yourself. I don't have any magic mix for getting some well deserved sleep, but I think helping your LO's reflux would be a good place to start. If you suspect you have PPD, you owe it to your kids, your DH, and most importantly you to get some help.
I always go with the saying that: sometimes the days are long, but the years are short.
There is a great support thread on the Colic, Reflux, and Crying Board you may want to check out. The ladies on the PPD board are great listeners. Use BW to its full potential and I really think together we can help you and your family.
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