The "electric shocks" are nerves reactions to being trapped somewhere. The numbness comes from slipped discs usually at L4/5 S1. But it's also completely normal unless it spreads upward.
Your GP has done the right thing, so in the meantime, try a rub like Radian B or Ibuleve. For sleeping try a pillow between your knees to relieve pressure.
You should ask for an IRM scan. It could be stenosis causing compression on the nervous system. I had this condition and had a lamenectomy operation to relieve the pressure. My neuro surgeon said I would become paralyzed without the op. I really hope your condition is not so serious and could just be a trapped nerve. Good luck
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