From your history I am able to understand that you were going for regular walking till 3 yrs
The pain in the thigh may be due to smoking
Veins are swollen near the Knee cap. What about the rest of the area in the leg. we have to keep in mind Varicose veins
Smoking & varicose veins reduces the blood flow to the legs.
Vascular study in both legs and treatment accordingly is advised
Anyhow smoking and alcohol even though wine should be stopped