Two minutes into my running a deep seated pain took over my left calf. Tried to keep running but it was affecting my stride, it felt like something was pressing on a nerve and making my leg feel slightly dead ( if that's possible). Tried to carry on but by 5 minutes I felt like I was slightly dragging it. I had to stop (so so annoying). Took another 5 minutes of walking for it to disappear but tried running again and there it was again gnawing at my left calf. Not down my shin but more to the left of it. It has always been there slightly but definitely reared its ugly little head today. Maybe I need different trainers, or possibly a new leg. Any advice welcomed.