last to first - St Johns wort. Proper exercise.
For energy - work on rejuvenating and virilizing yourself. I will leave you to do the research.
For a quick fix, ginseng is really really good, I would also recommend ephedra(if you use ephedra in a Red white & blue you come out with 3 types of amphetamine - this should tell you a lil bit about how powerful it is as a herb).
I personally just use bananas, mangoes, ginseng, and guarana, but I wouldn't suggest guarana if caffeine doesn't agree with you... It contains twice as much as coffee beans do, the buzz is more euphoric though, doesn't make me feel tweaked in the same way at all.
Yerba Mate tea is slow release - but also caffeine - I like it though - I use it to go raving or hiking.
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To be honest though I wouldn't do ANY stimulants if you've got this sensitive to caffeine - sounds like your body can't handle any right now, plenty of warm milk for you! Calm you down, stop you getting emaciated!