Hopefully these will ease your mind a bit.

Some don't get any clots at all, just be aware of any symptoms of a clot.
Some have had major swelling of whole hand & arm and no clots.
Many people just have thinner skin so the veins & such just show more.
( If they are bulging then that would be different from just showing thru the skin)

Stress and worry will make you tense up and that stops/blocks the free movement of fluids in the body. This fluid movement is needed for cell cleansing /detoxing of the bad stuff to get it out of our bodies.