it can be due to nerve compression at the back rergion. reason can be a slip disc which increases when you drive.
Next Steps
for back , go to a physiothertapy clinic. get ultrasonic therapy done if any tenderness+TENS/IFT+ SWD will relax the muscles+Traction(if required)+ some exercises(stretchong and strengthening)
Health Tips
Avoid forward bending,prolonged travelling ,weight lifting and stair climbing, no long driving or travelling...Need postural correction i.e. sit tall,...Avoid cold exposure.....GET WELL SOON!