Could you say more about how it works? You seem to be saying that metta either allows you to relax into each experience, or that it is the act of relaxing into each experience. If it is the former, then could you descibe in more detail what it is or what it looks like (the act or perception of metta) that results in relaxing into each experience? Or if it's just relaxing into each experience, then how is it different then, for example, equanimity or patience? Then there's the idea of directing metta towards some recipient as against the experience of metta qua metta. How is this experience of metta qua metta different then, for example, attending to the blissful aspects of breathing?
Just keep breathing in and out like this. Don't be interested in anything else. It doesn't matter even if someone is standing on their head with their ass in the air. Don't pay it any attention. Just stay with the in-breath and the out-breath. Concentrate your awareness on the breath. Just keep doing it. http://www.ajahnchah.org/book/Just_Do_It_1_2.php