I Have Been Experiencing Pain In Right Lower Leg For

I have been experiencing pain in right lower leg for the past 4 months, it started out feeling like a pulled calf muscle along with muscle spasms in the calf and also throughout the entire leg. I had an ultra sound on leg to rule out deep vein blood clot. I also had an MRI and now waiting on results. The pain increases dramatically at night and keeps me awake from 2am until early morning. Pain ranges from aching to burning with pressure building in the foot area at times.