I just started DBT training a couple weeks ago. I will meet weekly one-on-one with a Linehan Institute trained therapist and also go to skills group once a week. The first week, I felt very good about this therapy and noticed a difference after just one session. However, I seem to have a "therapy hangover" from my second session that has lasted well into the next day. Only a couple days ago, I was feeling very happy and grateful about my new job (copywriter for a small advertising agency--I've always wanted to write for a living but never put myself out there, until I got hired by an old high school buddy--and I've loved it so far) and for the first time, felt like I didn't need a relationship to feel complete, that I just wanted to focus on growing my career for the time being--I even stopped experiencing the constant identity questioning and decided that it was because I had found my "right job" (yeah, I know, the economy could change, blah blah, there is not one true job...). Then the next day, I am slightly triggered by seeing a photo of my ex on instagram, but tell myself I'll be okay and I move about my day. But in therapy, we talk about triggers and I start talking about how my age is a trigger because my ex moved on to someone younger (I'm 34, the new girl is 25) and I lose it there. Therapist gets me through the rest of the session, we stay focused on certian skills I can use when I'm getting into unproductive thought/emotion cycles. But it's 29 hours later and I still feel that hopelessness and inability to cope with reality that I felt when I learned that he was seeing someone new. I vacilliate between wanting to hurt him and wanting to kill myself (actually, I wouldn't get near him right now, but I get intrusive fantasies of wanting to hurt him), feeling like I will never love again, especially because I am past my prime and was cute at the most at my prime anyway. I see a friend of mine who is also sort of instable and only a year younger than me, but she goes from one relationship to the next because she is so strikingly pretty.  Anyway, I try to use the skills, they last for a few moments, but there is this constant feeling of sadness that won't go away and I can't focus on work because it seems meaningless and unreal in comparison to this hole in my life. Like I keep telling myself that I need to have the copy for a project done by tomorrow morning, yet I can't sit down to do it.  
This sudden shift could also be due to hormones, I could be PMSing. But does anyone experience a sort of therapy hangover? Is it normal? Or does it sound more like self-sabbatoging--not focusing on a project in order to bring about the failure that I've been lowkey fearing since I go hired? I've also considered that the pain is resurfaced because deep down I never really accepted that things are over with this guy, and I'm now talking with somebody about how to deal with things being over. I don't know, it hit me all of a sudden and it's making me feel hopeless, like I can never be content and that I'll never be able to hold down a dream job due to my instable moods.