How do I overcome fear of hospitals?

I, m24 am growing increasingly “scared” of hospitals. All started when I was about 12, I passed out getting blood work. Has escalated to passing out with needles, getting my blood pressure etc. Recently, my grandfather was diagnosed with beingreallysick and whilst visiting him i am in fight or flight trying not to fully blackout and hit the floor. Yesterday I heard beeping coming from someone’s room and it took me 2 1/2 hours to get back with it. Is this normal? How do I fix it?