My son has severe hemophilia, and we start IV's on him at home at least twice a week. For a long long time he had horrible veins and was a very hard stick, so I feel your pain (I am the one who does the sticks).
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Arnica oil really helps with the bruising and pain, in our experience. Not the homeopathic arnica cream, but the oil. We found the cream helped with the pain, but the oil helped much more with the bruising than the cream did.
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You could also soak a cloth in castor oil and wrap it around your arm all night long -- we found that really helped, but my son was young when we were trying it and he would pull it off at night. If I were you, I'd do the arnica oil right away, and repeatedly throughout the day, and then the castor oil-soaked cloth that night.
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We also used a product called scarmassage to help his veins recover from multiple sticks, but it's a long term thing so I have no way of knowing if it helped or not. He has finally this year grown big enough that his veins are easier to get. We have short push infusions, not long drip infusions, so we don't deal with infiltrated veins, but we do have blown veins -- less now than we used to. But I remember when he used to get huge purple hematomas massed in the crook of his arm. Hope it gets better for you soon. Do you drink a ton of water before they try the stick? Have you tried showering right before they try the stick? Or doing a little running in place, until your heart is pounding, before they do the stick? All those things help my son's veins stand up. Actually, he jumps on the bed instead of running in place
. Hope some of this helps.