[Sundae]

Some bodies just can't deal with caffeine.
I know - mine can't.

I've deliberately used ot to lose weight before (when I've only needed to lose 7-10lb) and it turns me into a monster.

Even normal caffeine use leaves me prone to migraines and shakes. Sorry, I mean more prone.

If you think you are even slightly sensitive, give a two week ban a go.
I get what you are saying re being drowsy, but that might be because you are having trouble sleeping.

Caffeine gives you a scratchy, startled high at best. Find a taste you enjoy and use that instead. I have de-caff (British Tea) teabags and find I only need one or two cuppas a day now. Or Nettle and Peppermint. And I have a jar of de-caff coffee that I broach about once every three months.