Please tell me can drinking chamomile tea affect my ability to donate platelets?

No problem: Interesting question as it sounds like you may be aware that chamomile tea is known to prevent platelets from clumping, thus preventing blood clots. This is a good thing, as if platelets clump then they'd be of no use to the person you were donating to. You don't want platelets to clump until you need them to form a blood clot. Effects of chamomile on them should not persist. Go ahead and donate!