You don't explain what you mean by suffering daily anxiety or whether the lack of sleep started because of anxiety. There are a lot of reasons for sleep problems. If you're on medication and it isn't working, it isn't the right medication for you. And whether medication is the right response or not depends on how much your life has been affected -- usually you would be sent to a therapist first to see if you can work it out in a way that lasts, because medication only treats the symptoms, not the cause of the problem. Even if you do need medication, you should still be seeking therapy if you ever want to stop taking medication. There are many techniques anxiety specialists can teach you to help you sleep to see if that works -- progressive relaxation, meditation, exercise, dietary changes, lifestyle changes, gentle remedies such as melatonin or chamomile tea -- sometimes it doesn't take a lot, sometimes it does. Also, you don't say what antidepressant you're on -- some are more stimulating.
Ah, sorry to hear this. What is the other medication you are on and how long have you been taking it? There are many treatment options for anxiety and sometimes changing doses (often to a bit higher) or medications will work to combat anxiety. Talk therapy is also really important to fully overcoming anxiety. Exercising helps us be sleepy at night. What about melatonin? Agree that Ativan is not a great long term solution. So, would work on better treating the anxiety and some lifestyle things that are more of a long term plan. What are you anxious about? Is something going on or is it out of nowhere anxiety? (which does happen).