At one point, I started to get a headache and feeling shakey. I cut down how much coffee I had, I drank from big mugs and started to reduce the size of the mug. I have about roughly about 4 cups of coffee a day but they are spread out. I think drinking tea helps too. It's difficult so I don't really have much advice. I think just reducing the amount of coffee and perhaps the size of the mug might help and an alternative drink.