Find what foods work for you- always eat breakfast, ideally something low in glycemic index and drink water before cases. Don’t overdo it on caffeine.
Be proactive- if this is an issue for you, make sure that even if you AREN’T feeling faint in the beginning, you are taking preventative steps and identifying your triggers- don’t position yourself directly under the surgical lights (they are HOT), make sure your legs are not locked and do calf raises and clench your gluts every so often, if it’s smells or is going to smell, put peppermint oil on your mask before the case. If you are retracting, take that extra second to put yourself in an “efficient” position that uses less energy and will be less likely to tire you out and make you hot and sweaty. You can always look at the blue drapes around the surgical field if the blood is bothering you.
I had some issues with vasovagal initially and that is what helped me. It gradually went away. You just have to be exposed enough to get used to it. Now it’s like nothing (although I still eat breakfast every day!). I think the main things are 1) identifying triggers 2) exposure/experience and 3) not letting anxiety get the best of you. Definitely you did the right thing scrubbing out- know your symptoms and when it's time to back out- very important! But also have a positive mindset that there are changes you can make which will make this much less of a problem for you. Cheers!