Im really sorry you feel like this. Mixed episodes are the WORST.

What helped me yes was walks. When I would feel the most revved up, when I would feel the worst of dysphoric mania (when I would be shaking in my skin hating myself and wanting to do all these bad things to myself) walking helped. It was like- if the outer me could find some way to channel inner mes energy... I could move it away from being so negative and painful.

But mixed episodes suck. I wouldnt wish it on my worst enemy. I hope your doctor is also helping you through this and you can move past this episode into something better really soon