breastfeeding

Laura
So I've been breastfeeding my son since he was born (5 weeks + 1) and only pumped twice once in each breast, but recently my right breast is filling way quicker and find when my son latches it squirts when he lets go and find him coughing as if he's getting too much to quickly. I don't want to pump on the right breast as I think that'll make it produce more but does anyone know of anything I can do to perhaps slow the flow down? Just it is starting to get solid more and hurt slightly if not relieved .... 
Any suggestions are welcome :)