I have been where you have been. My 5-month old was taking 30/40 minute naps and waking up so tired and angry a month ago. I felt like I couldn't enjoy him because he was always so tired. His nighttime was just as bad because I was up every hour giving him his pacifier or shh/patting him! He also seemed to get more upset whenever I would do anything to try and get him back to sleep. I felt so tired, worn, and depressed. I was not able to try pick up/put down because I also have an 18-month-old and can't leave her alone. So, we ended up letting him cry, checking on him every 5 minutes. The first night was not fun and I debated whether we were doing the right thing, but it improved SO much within days. He is now 5-months, happy, and follows the four hour routine. He is such a different baby, and I am such a better mom. It truly changed our whole life! Some may not approve of this method (I didn't at first), but I didn't know what else to do! I really feel for you and understand how you must be feeling. Just make the best decision for you and your baby! Good luck!