Weak veins in hand and legs. Remedy.

In last couple of years my hand and leg veins have become more visible and prominent. Can't stand or sit for more than few minutes as pain increases . There is constant pain . There are no signs of varicose veins. Recently veins are also visible in thigh. There is discomfort , itching , irrigation and pain all over leg and hand veins. Took lot of medicines from different ayurvedic doctors but did not work . I am underweight 5.7 height .with 48 kg weight . Can't eat or digest large portion of food , if eat vein pain increases . There used to be constipation and heaviness in stomach , with proper sleep and controlled eating habits recent have control over stomach heaviness and almost no constipation. But pain in veins is same. In Summer pain is more in veins and eases in winter. Can't eat anything that's hot in nature such as ginger. Can't digest a glass of milk there is often heaviness in stomach if milk is taken. Please suggest remedy.