Did you ever find out what was causing your hand vein issues? I'm dealing with something very similar with blue roadmap like veins on palms of hands as well as swollen and sore veins going up both index fingers. I've been fighting Lyme and co-infections for many years and I don't know if it's just another symptom manifestation or not. It's been going on about 6 months now and it totally freaks me out because it's so unnatural. If you learned anything new over what was causing yours or how you dealt with it I'd really love to know.