That's the kind of rhythm issue I would mention to my doctor before getting back into exercise. 220 is well above you max predicted heart rate (167) and depending on the duration it could very well cause you to become faint.
Again, please mention this to your doctor to get it checked out. I would stay off the exercise until I spoke to some one, that's just me.
Good luck!
Jon
your pb and pulse looks good to me. Mine is low like that. I would however have a holter test done to see whats going on, because its not normal to feel faint from working out.