Whenever there is such pain in meditation, I've found it usually points to karma that's activating. In which case they key thing is not to visualise something else, that just distracts you from the pain. The best is to keep going right into the heart of it until you become awesomely okay with it. Then ultimately it will dissolve and you may get some insight as to why it's there.

It's the same with going out of the body. I witness it all the time. It feels great - a wonderful spiritual experience, yet really what's going on is the soul working to get away from the pain. It's a part of the distraction techniques often used by OC. Our freedom comes from penetration of the discomfort and dissolving of identity with it.

I know it sounds tough, but once we get used to it, the transformations are nothing short of profound.