Passed out while donating blood. Am I not a good donor?

I donated blood for the first time today. I felt fine up until about half way when the phlebotomist started poking around in my vein. I started to get nauseated, I looked at my skin and I looked ghostly, then I started to see colors and BAM I was out. My BP dropped from 120/78 to 90/70. It took a while for it to get back up, and I’ve been in bed since because every time I get up I feel faint.

I was really excited to give blood and now I just feel kind of upset/down. I couldn’t finish it so my blood will go to research possibly. Still feel kind of bummed.

I should have known this would happen because I pass out almost every year in the summer because my body can’t tolerate the heat. In other words, I pass out easily.

The lady at the desk told me to eat a lot of protein next time. I ate pancakes and chugged a few gatorades before this time. Maybe that was stupid of me?

In a couple of months should I try to donate again? Or am I just not a good donor?