Ok this will probably sound insane, but I will tell you how I got over my original needle phobia. I used to be so phobic I would pass out while just receiving an injection. I would be freaking out for hours leading up to an injection. I would get woozy seeing someone else get an injection.
So when I was a missionary in South Korea in 86 to 88, I had a problem when I had to get huge, painful shots of gamma gobulin every 3 months.
I knew I had three months until the next one, and decided to rewire my brain before then.
So I worked on convincing my subconscious that needles were my best friend.
I did imaging exercises, desensitizing myself by richly imagining wonderful mind-blowingly comfortable and fun times with needles, working up to getting dozens of fabulous, pleasant injections.
I changed my self talk, and said several times a day, "I love needles, and I always enjoy getting shots". I worked my way up to elaborations: "I love the anticipation, knowing that soon my amazing needle will be sliding into my welcoming muscles, to linger langorously while it delivers its healing, protective elixir right to where I need it most.
"I can't wait to feel again the cold kiss of steel, the welcome little pinch then that wonderful feeling when it slides in effortlessly like I am made of butter.
"I can't wait to massage my glute once the sweet needle leaves me and I rub the marvelous medicine to help it spread all through me, transforming me, making me strong.
"I love all needles, but I especially love my next needle. Come kiss me needle. I will tell you when and where! You serve me, and my aching need for your tubular steel ."
And I used to sing needle love songs. Picture this sung to Phil Collins' Jesus He Loves Me.
"My needle she loves me,
She makes me strong,
Been waiting for Needle,
All week long!
Can't wait to inject you
In my thigh
I will never reject you Needle!
I'm your guy!"
Sounds crazy I know, butcthe stronger the emotional associations and the more often we reinforce them, the more they overwrite and override the associations that were there before, so the new association becomes automatic.