K.H.
I have a 4 month old with acid reflux - changed my diet and he is on medicine too - so I've gone through this just one step ahead of you. Have you read the book "Healthy Sleep Habits, Happy Child"? It has helped me alot to encourage me to do whatever it takes to get my baby to sleep as much as possible. I have let him sleep in the bed with me (just during the day, when I lie by him awake), sleep in the swing, carseat, whatever. The author says to especially do this for morning sleep because that gives the most rem sleep that produces a hormone that will help calm them to sleep now and in the future. So - we rarely do anything to mess up that morning nap right now! Also, if my baby wakes up after 20 min. (or really anything less than an hour), I quickly pick him up (before he's good and mad :)) and rock him back to sleep. He usually falls back asleep quickly and will stay asleep for another hour or so. I've done this for a while and it has worked for us and has helped to develop MUCH better sleep habits for my baby. He now normally takes about 3 naps a day, 1.5 to 2 hours per nap - rarely waking after 20 min. or so anymore!
Hope it works well for you!