Not lately but I do recall flipping out with my mom oneday thinking the vein in my leg was going to explode not sure if that is possible even but it was so out. I assumed it was from inflammation. I am not sure if it is similar with limb veins but with my eyes when the veins pop out my doctor told me it was from inflammation. Of course though there could be other issues so I would talk to your doctor.
Mads I totally get the pass around from doctor to doctor too. It is frustrating