@Mayaaa i'm sorry to hear what you are going through. just remember how much stuff you've already dealt with successfully and know that this will soon be over too.
Energy drinks might also not help anymore because of the extreme sleep deprivation. I understand your struggles with sleep to a certain extent, since I'm also experiencing a similar thing right now. Others already gave some good pieces of advice. If you want, here's a few of things that help me:
- try some melatonin (helps with sleep) or valerian (a herb that calms nerves and makes one sleepy; take inxrease the dosage if needs be)
- focusing on breath helps me personally to fall asleep faster (after taking a higher dosage of valerian) 
- don't do in bed anything but sleep. this way your brain will associate it with sleep and you will fall asleep faster
- don't take naps, especially after 3pm
- if you drink anything with caffeine, drink it at the earliest two hours after you wake up. this way it has a better effect.
- drink energy drinks / coffee only if absolutely necessary. this way your body doesn't get used to the effect of caffeine and when you need it, the effect will be stronger
- try switching to black tea and dark chocolate when possible and when only light energy kick is needed. both have caffeine as well
- listen to your body. you know best what you need

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