I haven't confirmed from a doctor that I've experienced a mixed episode but I've experienced at least something similar. I would feel like everything was nails on a chalkboard. I wanted to crawl out of my skin. I needed something I couldn't describe. I would pace because I had to DO something but I didn't think anything would help. I would rock myself to try and help or drag my nails gently on my legs back and forth. I felt like a mess of confusion. I wasn't happy, I wasn't sad I wasn't anything I can describe. It was like torture. I was tired but I had energy to expend. Super bizarre really.