hey Steven,
Have you been a runner before you started this activity or engaged in any other sporting activity? If not, and youy just suddenly started running on your own whim, then maybe you are going about it all wrong.
Most importantly are you increasing your pace and time by the guidance of a professional trainer?
Its important that you know when its time to increase the pace on your running and how, just by hicking up the speed when yoru muscles are not yet ready for it, you will definately cause a great deal of damage to your body and mostly to your muscles and soft tissues... U need to stop and properly assess your running technique as well as your running pace...