Hello
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You have been prescribed lorazepam for insomnia by doctor. You have problem of night mares and ruminations in night. The problem may occur due to disorder of sleep cycle. Rapid Eye Movement sleep is sleep in which night mares occur. Lorazepam is good medicine for insomnia but it may increase night mares. I would advise you to please visit your doctor and take opinion about other drug. Medicine like Zolpidem have short lasting effects and will not disrupt the sleep cycle. Other medicines like Ramelteon, Melatonin can be used.
Improve your sleep hygiene.
Try yoga and meditation to relax yourself.

For detailed evaluation visit a good psychiatrist.

Thanks

Hi Cmfonfara,
Welcome to HCM Forum,
I can understand suffering you must be having and dilemma you undergoing.
You having sleep onset and maintenance problem with shallow dreamy sleep.As you taken mentioned medicine for prolonged time than intended you developed tolerance to its effect so its not showing desirable result.
Sleep problem could be a sign of underlying other mental illness.So its advisable that you meet to nearest psychiatrist along with your heart physician paper.He will asses you personally and will definitely help to get rid of this problem.
Till then follow sleep hygiene as mentioned below -

1) Avoid napping during the day; it can disturb the normal pattern of sleep and wakefulness.
2) Avoid stimulants such as caffeine, nicotine, and alcohol too close to bedtime. While alcohol is well known to speed the onset of sleep, it disrupts sleep in the second half as the body begins to metabolize the alcohol, causing arousal.
3) Exercise can promote good sleep. Vigorous exercise should be taken in the morning or late afternoon. A relaxing exercise, like yoga, can be done before bed to help initiate a restful night's sleep.
4) Food can be disruptive right before sleep; stay away from large meals close to bedtime. Also dietary changes can cause sleep problems, if someone is struggling with a sleep problem, it's not a good time to start experimenting with spicy dishes. And, remember, chocolate has caffeine.
5) Ensure adequate exposure to natural light. This is particularly important for older people who may not venture outside as frequently as children and adults. Light exposure helps maintain a healthy sleep-wake cycle.
6) Establish a regular relaxing bedtime routine. Try to avoid emotionally upsetting conversations and activities before trying to go to sleep. Don't dwell on, or bring your problems to bed.
7) Associate your bed with sleep. It's not a good idea to use your bed to watch TV, listen to the radio, or read.
8) Make sure that the sleep environment is pleasant and relaxing. The bed should be comfortable, the room should not be too hot or cold, or too bright.

Hope this will help you.
Best regard.