Thick Veins appearing after viagra use.

Had a thick vein appear along my penile shaft, it connects to another large vein which became prominent a couple years ago. So I now have one on the left side and this one which starts the base and goes to right hand side of the penis along with some other spider veins which have also become more prominent. These two are massive. I am very sexually active and occasionally I take viagra for recreational use before sleeping with a new girl to ensure I reach my full erection, I think this is a mental thing as sometimes with a new girl I'll only get hard enough to penetrate but I'm not at my best. I've just thrown them in the bin after seeing this other massive vein appear and I'm starting to get really worried, I'm concerned that the viagra has caused this because the first large vein also a period the day after a small amount of Viagra. This time it feels abit tender and I am concerned that I could have caused myself s problem. They look like varicose veins, what do you think this?