First of all, if you are feeling suicidal, please seek help immediately. I believe you are in India. Here is a list of organizations in India that can help:
http://www.suicide.org/hotlines/international/india-suicide-hotlines.html
We never lose our ability to sleep. You can regain your previous capacity to sleep.
Your sleep issues were triggered by a period of heightened stress — and this is completely normal! However, after the stressful period passed, your sleep continued to suffer. That is probably because you began thinking a lot about sleep and worrying about your sleep.
Unfortunately, as soon as we worry about sleep, pay it a lot of attention, or try to control sleep, we immediately make sleep more difficult. That’s because these actions activate our arousal system (also known as the ‘fight or flight’ response).
Prolonged periods of little to no sleep build up a strong sleep drive — and that is why, after a period of very poor sleep you found that you managed to get eight hours of sleep. This is evidence that you are still capable of sleep.
Have you looked into CBT for insomnia? You may want to ask your doctor about this since it will help address the anxiety and worry you have towards sleep. When you begin to reduce this anxiety and worry, your sleep will begin to improve.
Good luck, and keep in touch.
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