Every time the bottom of my left foot feels a prick I feel one in my stomach, is this normal?

Maybe? I am not sure what you mean by "feels a prick" but if there is sufficient pain many people with have an abdominal response. This has been limited to significant pain from a fracture or bad sprain in my experience.
Yes. Yes, don't worry about this. Nerves transmit electrical impulses in both directions and potentially to different spinal cord levels when stimulated.