About the concentration, break it down into seeing and hearing.
Try trataka, start with 1 minute a day, then build up gradually, stare at a candle, JUST OBSERVE, don't let your mind become engrossed in any thoughts, when it does, release the thought, remind yourself that for 1 minute you can do this concentration exercise.
Similarly, repeat OM, ooooommmmmmm, really concentrate on the sound, when thoughts barge in, let them go and concentrate again.
Use a stop watch. Be very strict, for 1 minute, build up slowly, it'll come back.