I haven't been able to sleep properly and I'm experiencing muscle twitching and vomiting

26M, 191cm, 96kg, vitamin D deficiency

I haven't been able to sleep for more than 3 to 4 hours for 11 days now the last 2 days were especially hard I've been vomiting, the muscles in my right arm and my left eye keep twitching non stop and it's so annoying, I went to the doctor and he prescribed me potassium and melatonin which I told him I have both and they do nothing for me, and he said I don't have the authority to prescribe you a sleeping medicine, not sure if I'm giving him an addict vibe and he's scared to prescribe me something since I live in the middle east, at this point I'm going insane and I'm unable to move from my place without experiencing nausea and disrupted heart beat, I can get my hand on valium, pregablin and tramadol illegally, will I sleep if I take one of them? I cannot handle this anymore and I'm out of money for doctors as I stopped working since this happened