I feel like I’m losing my mind

First post, I haven’t been on Reddit in years excuse the formatting etc . But I need this off my chest.

I guess the best way to say it is I’m so tired of being TIRED. Somehow, I’ve managed to still be working full time but God I don’t know how much longer I can keep it up.. If I get too comfortable, I fall asleep sitting up. When I’m too hot or tired, my legs feel like noodles and I lose grip in my hands. The constant headaches, and slumping, and not even having energy left in me to eat or take my meds at night is wearing me out. Honestly the worst part is being young. Everyone tells me I should just take a multivitamin or try this fad energy smoothie thing or whatever the fuck.. “get up earlier,” have a coffee,” “eat more protein.” I can’t stand it. And my back and knees hurt constantly. Muscle relaxers are the only thing that helps but they make me so groggy afterwards that sometimes it’s not even worth taking. I’m just so exhausted and I don’t know if any of this makes sense. I don’t even know if I have narcolepsy, but both it and sleep apnea run in my family, so I know something is wrong. Does anything other than medicine work for y’all to ease the fatigue? I seriously can’t keep doing this.