Well I can't necessarily go from upset to calm very quickly but my ptsd symptoms have gotten much worse lately and I have noticed things like no longer feeling happy when I hear my favorite songs, not wanting to listen to music at all, or watch tv, or read, or go out, etc. I don't want to talk to anyone. I miss my family but I cringe when the phone rings, yet i miss them so much! I don't feel much of anything except guilt and shame. I used to love to sew and make things now I have absolutely no interest. I just want to work all the time. The only thing that gives me any joy is trying to help other people and I hope that doesn't go away too. It's like I've given up on myself. I wish it wasn't so. I hope you get your happiness back and I definitely think you should talk to your therapist about that if you feel like you can.