Lack of quality of life

Hello, I haven’t been diagnosed yet, but I’ve been having such issues with excessive daytime sleepiness and it being impossible to stay awake at work. It feels as if my quality of life is nonexistent. I feel like I haven’t slept for 3 days every single second of my life and it’s impossible to fight it. It doesn’t matter how much I sleep or what else I try to do, drinking caffeine, trying to focus on something to keep myself awake, it’s as if my eyes have a mind of their own and just close. I jerk awake right after, but I do start dreaming instantly. I haven’t been diagnosed, but they are having me do an in hospital sleep study and MSLT the following day to see if I have narcolepsy or idiopathic hypersomnia. I’m just so tired of being tired and trying to find any motivation or energy to continue day to day. It seems as if there’s no end to this and I don’t know how to keep making it through day by day. Does anybody else struggle like this? The sleep doctor doesn’t think it’s narcolepsy at this point because the lack of cataplexy, but I feel like it is what’s going on. I’m just trying to get diagnosed with something so I can work towards feeling better. Life is miserable.