Similar experience here, I drink decaf espresso and more than 1 cup even of decaf in the morning can leave me jittery and clammy for most of the day. So I try to limit it to 1 per day and skip days as well to ward off headaches. I've tried adding L-theanine on occasion (which for some seems to steer the effects of coffee more towards tea) and it might help some for me but not by much.