I am recently widowed and had to have help to avoid nerves and almost panic attacks. Dr. first put me on Lorazapem ..to take as needed 1m or1/2 pill every 6 hours. It didn't help me to sleep all night as I woke around 3:30, no matter how late I stayed up. Then I was put on Mirtazapine (15 mg) at night . Dr. said if I still woke up at that early hour to take 1/2 Lorazapem. Is this combination safe.