Can an eating order develope this fast? Or is it in my head?

Ummm i ppurged last night fro the first time ever, to a point of a little blood :( Because i hadnt eaten that much yesterday :( I had been thinking about bulimia and anorexia for a while...ii thought it would take a while to develope but today i wasnt hungry at all but i ate an orange today and then tonight my mom made me eat some monzzorella sticks cause she noticed i wasnt eating soo i was like "ok sure" but then it made me feel terrible!!! and i mean Terrible!!! I sware i can see the weight i gained!!!! Soo i just purged it all back up!! Does it really develope that fast??!! Because it wouldnt stay down!!! And i look soo much fatter compared to yesterday no joke!!!!