I see you!
Kidding aside - this sounds normal, or maybe you and I are simply abnormal! I have felt like this...I think its a part of the healing process from trauma and grief. Three months is not very long in the scheme of things.
You could take a proactive step and go join some classes in something new (yoga? gourmet cooking?) or even call that dog park friend and go have lunch.
Sometimes simply rolling with it until it goes away helps. I have these on and off again feelings of "surrealness"...like I am outside of myself looking in on my life.