So I think he found out the issue(after serious pain): sitting and driving the car all day isn't a problem but sitting in the wrong angle is. I've used the thigh pad on the car seat and I've set it too high so that my thigh has been in a higher than 90degrees angle which has lead to my glute being in a stretching position for the whole time I'm driving. This causes the glute's smaller inner muscles to contract and that presses the Sciatic nerve which caused the numbness and dull pain in my whole leg. So hopefully he is right and now after the treatment he gave me it feels a lot better.
He also advised to use a ball to roll the glute's smaller inner muscles just before running(especially on days when I'm working). So rest today and easy try-out run tomorrow.