I'm on day #2 postop for sleeve and am having headaches, even while taking liquid pain medicine? Finally figured it must be a caffiene headache (lack of) so I sipped some crystal light lemon tea and it worked! My post op instructions say decaf is ok, with nondairy creamer and that the only perils of caffeine are appetite stimulant and diuretic...I'm gonna try my usual cup in the morning, will see how it goes.....:001_rolleyes: