I still have to try DBT, but what I have tried (and I'm fairly under controll at the moment) is to rationalize every "negative" feeling I have.
Every relationship I have seemed to be about to break, so I sat down to think about everything that made me upset, and I started to write why getting so upset about them wasn't rational and what I should do in case those situations happened again.

I guess that is a good first step.

Also I hung for dear life to any happy moment I experienced haha. The point is to always be concious about what you are feeling and to analise why you are feeling that way. Except when you're happy, in that case just gooo with the flooow ;P