Aching in top of left thigh and pins and needles starting in my left foot? No accident or injury at all. Starting to get slowly worse?

See neurologist. Nerve irritant is likely cause. Emg-ncv testing can possibly pin point anatomical region of compression.
Pain worsening.... Can indicate only one of two things: a) beginning of a nerve injury/spinal cord compression at the l-4/l-5 nerve root or you have an arterial blockage (plaque) developing in the upper to mid thigh region that is causing nerve pain in the foot from a lack of blood flow to the foot. If it feels better when you stand, its most likely vascular in nature; if not, then its spinal in nature!