OUCH! (help!)
General Questions
I think that the crochet hook was the reason your dreads broke off, not the separating that you did. Glad you threw the hook away, but it already broke hundreds of pieces in your dreads, so they were weak from that, they do get stronger with time though. You only waxed once and brushed it out, but did you get the wax out with anything like Dawn dish soap or Wax B Gone? The thickness of your dread is what is causing tension on your scalp. Hard to tell by the picture, but I think you can divide that one into a few, unless you want fat dreads, but they do cause tension when they are that big. Anything over a 1inch section at the scalp will take longer to dry and cause the tension you are feeling now. I kept mine around the temples thinner so that I would not feel any pressure of weight there, especially years down the road.
Baba Fats has a video on his page on how to separate dreads, a good one to watch. Due to your crochet, even once, you may still loose some of it, but lets hope not.
Did you start in August 2012?