What to do if i had some anxiety attacks and was prescribed ativan (lorazepam) 0.5 mg. is it safe to take it 4 or 5 times a week?

Probably safe: But I suggest you consider starting CBT therapy to learn skills to avoid, reduce and manage anxiety. What you'll gain can serve you for a lifetime and you'll notice you need the Ativan (lorazepam) less and less - maybe not at all. It can take patience, but it's worth it. Mindfulness Meditation is also great for helping w/ anxiety.