Been depressed for 3 years, been thinking a lot of suicidal thought and been crying so much! Dunno where to start?

I've been having conselling sessions in school and out school therpy. For how low I've been feeling my T has put me on medication called Prozac. Never been on anti-depressants, never thought I would be so despit to be actually happy that I'll been put on anti-depressants. One a day, my mum is looking after it as I can't be trusted with them. Just that eak I don't like to swollow big tablets, I hope they are not to big. Hmm sorry anixety, I worry to much now again.

Is there anything I should be careful about taking ANTI-DEPRESSANTS?