Chronic adminstration of caffeine and taurine (redbulls ingrediants) is only going to make things worse. If you really need the caffeine to help with fatigue steep loose green tea leaves, not bags, for 3-5 minutes. Talk to your pdoc about adding melatonin to your sleep meds as well as using light therapy. I think this provides a rather accurate set of instructions for using melatonin, although you may find benefit from a higher dosage than 150mcg due to the amount of stress you're under. I've also come to appreciate Darkness Therapy.