I can't donate whole blood either. It freaks my heart out. I can, however donate platelets and do so every two weeks with no issues. (Thank you for donating!) Smoking ANYTING after donating blood can cause this to happen-you have less plasma, red cells to carry oxygen, etc.
Sounds like you needed to cram the fluids big time but didn't.

Now that this happened, there's probably something in the back of your mind "warning" you in a way-that may be why you felt like this even with your friends lighting up. The "body memory" of what happened to you after donating blood and then smoking-and getting bad symptoms may very well be causing you anxiety, and possibly panic.

If you are smoking sativa and you are prone to panic attacks or anxiety-don't smoke it!

I have Panic Disorder and the sativas throw me straight into panic-BAD panic...

Indicas are a much better choice. Good luck!