hi - i've been on wellbutrin for a week, 100mg a day, and today i...

hi - i've been on wellbutrin for a week, 100mg a day, and today i was supposed to up the dose...but my scalp has been itchy, and today, especially, i noticed A LOT of hair falling out. every time i ran my hand through my hair i'd get a handful. looks like other people experience this side effect, too, but do people get hair loss this soon after starting the drug? i don't want to keep taking it if this is going to be a permanent thing...also...the hair that you lose grow back...right? i'd appreciate any tips or insights. thanks!