I'm not sure what to say that might help. I've always been fine with needles as long as someone else is doing the poking, but I have to inject myself once a week and once every other week for my treatments, and that shit takes mental fortitude. I have some sort of mental block that prevents me from just sticking the goddamn needle in. I'm slowly getting better at it, but its still sucks.
Actually... I have a sort of trick that might help. As I'm sure you know, trying not to think of something is counter-productive. If you just sit there thinking "Don't think about X" you're going to think about X even more. To get around this I replace it with something that I enjoy thinking about. Usually I think about the backstories and whatnot of my personas in the various universes I enjoy; for example, in the Star Wars universe, I'm a human who's mutated due to medical experiments and become immortal. Attempts to replicate the mutation ended horribly, and I eventually escaped the facility, putting a stop to it. By focusing on that, I'm not thinking about whatever it is I'm trying to avoid thinking about. Works great for getting rid of unwanted boners, too.
Edit: I think it only works if you really enjoy thinking about it, so try to find something relevant to your interests that you can mull over whenever you need a distraction.
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