Hello and welcome to HCM,
You have mentioned that when you sit as during driving or using computer for long duration, your legs start hurting.
This history is suggestive of some vascular disorder probably incompetency of veins and/or deep vein thrombosis
Incompetency of veins vause the blood to pool in lower limb and this pooling can cause pain.
Om the other hand, deep vein thrombosis can also cause swelling and pain of lower limb.
You need to consult a surgeon and get Doppler study of the lower limb.
If any of these disorders is detected, further management can be planned.
Thanks and take care
Dr Shailja p Wahal