I've started weighing everything now

I’ve been really obsessed for a while now; I can’t even put a bite in my mouth without calculating the calories of everything I eat. I now even weigh a single olive. I ended up crying all night because I had a slice of cake at a gathering yesterday. I feel really bad about this; I don’t know if this situation is normal or if I’m heading towards an eating disorder. People around me have started to notice too, and I’m a bit scared.