I was actually officially diagnosed at 14. Suspected looooong before that, but my mom was dead-set against me being medicated that young. After diagnosis, I was on meds for three years. Now I've been off medication for 10 years after completely re-ordering my life to work with it. Mainly, I have sporadic/disordered thought, inability to concentrate with the potential to flip to hyper-focusing on the strangest things at the strangest times, petit mal seizures (took a while to figure that one out, almost all conscious absence), mood swings with frequent "manic flight," hmm....those are the most prominent. There are some lesser symptoms, but none that cause as much trouble. Thankfully, my dear husband can laugh off the "butterflies in my head" most of the time :P.
I was actually surprised to find out that symptoms often get worse in adulthood, yet so many still consider it a childhood disorder thanks to gross over-diagnosis. As to your second question -- no, no sunlight and flowers any more than usual :). It is nice knowing where some of this crap comes from, though -- namely when I'd be certain I was listening to someone, then had no idea what they'd said at the end of it.