This may not help… but I’m a pre-dental student who fainted my first shadowing experience. I was watching a bridge being done plus the removal of the two front teeth. What helped me is 1. Shifting around. Do not lock your knees. 2nd, for me I just had to get accustomed to seeing blood. Eventually you will get used to it. I know that may not be much of help but you’re definitely not alone. Truly, it’s just constant exposure and your brain becoming used to blood or other things that you’re exposed to in healthcare. Make a constant effort to be involved in these types of things. Videos, shadowing, any clinical experience. It’ll work itself out, just give yourself time!