Im scared i have fatal insomnia, its been almost a month and i havent had a good nights of sleep , will sleep 3 hours on a good night?

I would see someone if I thought what was going on might be fatal. May need proper sleep study.

By definition, you do have a sleep disorder and it would be rather worthwhile to work with a physician to uncover the etiology. An overnight sleep study may well reveal answers allowing an effective intervention. A Sleep Hygiene program is certainly a valuable approach and should be commenced ASAP.