I've had injections on a yearly basis, I just got used to it. I suppose I don't really feel affected by it, because I'm too busy thinking about other things haha. I focus on things that would seem more stressful than my blood test, I guess my brain manages to prioritise stresses of life over any pain or anxiety from blood being taken out and being injected etc. It's also best if you try not to tense your muscles before you go in, I shake my arms and relax myself, easier for needle to go in. I dunno, I guess just distract yourself is the best way to go.