It makes me cringe to read about how much pain you're in, it's the worst pain in the world (I think - and I had back labor with my son). I'm shocked at the Miralax suggestion, doesn't seem to make sense. The vomiting is actually not due to the pain, although it is horrible, but since your body can't get the contents of your small bowel/stomach to go out one way, the ensuing spasms makes it go out the other. You have all the signs of a partial bowel obstruction - it's partial because the food eventually makes its way through and the symptoms clear up. I've been hospitalized approx. 15 times in the last 16 years with partial obstructions, and suffered through a few short term ones at home. One word of caution: I stayed home too long with my first major obstruction (I thought it was the flu) and ended up with peritonitis. Very scary. My rule of thumb since then is that I go to the emergency room if/when I begin vomiting. They can take a quick xray to see if there's an obstruction, you wouldn't think it would show up, but often it does. My doc usually has me do a hospital stay for complete bowel rest and steroids. It can be tedious, but the risk of peritonitis is not worth it.
If it's a scar tissue/stricture problem, and the "episodes" become more frequent and you're looking at surgery, the Mayo has perfected an awesome laparoscopy - strictureplasty procedure that is minimally invasive and leaves more of your small bowel intact. If it's not scar tissue but inflamation instead, hopefully one of the new medications out there will help you (but it looks like you're on so much already). But they take several weeks to kick in, so I really do recommend that you watch what you eat until you find out what's really going on - you want a low residue diet. If you do end up eating things like fruits, veggies and fiber, try to space it out. For example, don't have a salad and then a bowl of bean soup in one meal. Chew well, and don't eat too much at one time - give food a chance to move through without a lot of pressure coming along behind it. I drink a protein drink every day, and at times have been able to push surgery out another six months by being careful.
Good luck, I hope you can get the answers and help you need soon.