Thirdly, better IV technique is definitely something you need to work on if you have no usable veins. I don't know how long you've been IVing, but if you do it correctly, are sanitary and sterile when you do it, you should be able to IV for quite a period of time without much damage being caused. It might be beneficial for you to look through the OD directory for the link in there on proper IV technique.
P.S. You said you didn't mean to come across as rude, but perceptions are everything, so keep that in mind for next time. If you're calmer and a little less abrasive in the way you post, the community here will be more receptive to your and your issue and be more open to giving you quality solutions as well.