Vasovagal syncope - MayoClinic.com

eat breakfast

be careful when getting up

be careful when you raise your arms above the level of your heart

hydration

if you see a fainting spell coming, quickly get to the floor, back on the floor, and raise your legs. This was an advice given by a cardiologist who himself had syncope. I never got to implement it as I have been able to avoid fainting spells by following the rules on sufficient hydration, food intake, and care in getting up.