Sleep training

I have to be honest, these past 2 or so weeks have probably been more trying as a parent than the first few weeks he was home.  We've reached the stage where he just wants to be with us all the time, including when he sleeps.  Shortly after he hit 6 months, Colton decided that naps in his crib should rarely be longer than 20 minutes and the past 2 days he set a new record of barely 15 minutes.  I'm not sure that even counts as a nap.   I had somewhat anticipated this, so back around Thanksgiving I picked a training method and bought sleeping through the night by Jodi A. Mindell, Ph. D.   Similar to the Ferber method, she allows a little more leeway when it comes to periodic checks (as frequently as you need, but the longer apart the better) and soothing aids like a pacifier.   At the time I read this book, Colton was still sleeping through the night like a champ.  That all went to hell shortly thereafter.  Mindell advises that you begin with night time only, continuing to do whatever is necessary to soothe the child to sleep for naps.  Once self soothing at bedtime is accomplishing, you wait a week and begin with naps, but supposedly, self soothing should follow naturally once it is learned.  We'll see.   This is technically night 4 of sleep training, but the last 2 nights the poor kid was so worn out that I'd practically have to yell at him to put him down awake, so really it is night 2 of self soothing.  Saturday night he went down awake and started fussing immediately....I did a real quick check after dumping his bathwater, then did a 10 minute check and planned on a 20 minute check.  Half way through the 20 minute time block he fell asleep.  Unluckily that only lasted 3 hours and we resumed our waking every 2-3 hours for the pacifier.  Sunday night he went down asleep, but was up at 1:20 and would not go back to sleep.  I'm pretty sure it was gas pain originally, but after Rich took over an hour into it, it was clearly just wanting to be held.  So after feeding him, we let him cry it out with the same checking pattern.  He was out in 30 minutes.  He woke again an hour later and soothed himself in under 10 minutes.  Last night he slept through the night and tonight he was again asleep before the end of the 20 minute check.   I should also add that we are now swaddle free and in the sleep sack now, so all in all, progress is good, but it certainly is tough.