how long should someone keep using Lorazepam for anxiety until he gets addicted to it?

Hi everyone, I am 22 years old who had his first panic attack about three weeks ago. Ever since I have been suffering anxiety disorder. The ER doctor prescribed 15 tablets of 1mg Lorazepam. I can't lie, it does miracles with anxiety and it puts me to sleep right away, but I have searched the internet and read many horror stories with people getting addicted to this drug or suffering from withdrawal symptoms. So I decided not to take it unless I REALLY need it. I have taken 15 tablets so far in the past 3 weeks (no more than 1mg per day). So an average of 5 mg per week. Anyhow, I also saw a psychiatrist who prescribed Citalopram, and he gave me more Lorzepam to use until Citalopram's effect starts kicking in. So my question is: how long should someone keep using Lorazepam untill he gets addicted to it? Have I taken it for long enough that I can't suddenly stop taking it? Overall, what do you guys recommend? should I keep taking it for a little more? or should I just stop taking it? I really appreciate your help