I was suppose to get a blood test but have a phobia of this and couldn't go through with it?

i know it sounds stuiped but i was at doctors office and he wanted me to get a blood test as i had been complaining about headaches and fatique at work. but i felt it may be unnecessary or searching in wrong direction for answers. i told him i was suppose to get one 10 years ago but backed out of the idea and had a severe phobia of the whole thing and couldn't likely go through with the idea. i walked down to the lab that did the tests but couldn't even walk past the front desk and had no interest in going through with this. i'm not scared of needles as i had several shots when i was younger and handled them ok , its just the whole idea of blood being taken out of me that just freaks me out completly , i have also never been able to donate blood and don't even know what my exact blood type is
I was suppose to get a blood test but have a phobia of this and couldn't go through with it?
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