Insomnia Support Group
Insomnia is a symptom, rather than a disease, and is characterized by inadequate quantity or quality of sleep. People with insomnia complain of difficulty falling or staying asleep, which results in significant impairment of daytime functioning. Insomnia is categorized as transient (shorter than one week), short-term (one to three weeks) or chronic (longer than three...
http://www.brainline.org/content/2010/03/sleep-and-traumatic-brain-injury_pageall.html
I hope this helps. Please keep us posted on how you are doing. I am so sorry to hear you are going through such a difficult time.
Your internal clock is sometimes called your circadian rhythm. More accurately, your circadian rhythm that controls sleep is keyed by your inner biologic clock, which responds to a number of environmental cues, especially light, to re-set each day.
Fatal insomnia is an inherited genetic disease. So unless you have a blood relative that's had it (you'd know), the chances of you having this are basically nil. Hope that helps.
Considering your medical history, you might do well to ask your doctor for a referral to a sleep specialist. Meaning a medical doctor who specializes in sleep.
You should be confident that sleep is one of the most basic needs in life, akin to breathing and drinking. Your body will at some point get the sleep it requires regardless of what you do or don't do.
There are many things you can do, however, to help this natural sleep process.
Sleep specialists often use non-drug treatments to address insomnia, particularly CBT or cognitive behavioral therapy, which helps most people who try it.
In your case whatever you do should be closely monitored by your doctors.
good luck to you.