Welcome to Neuro Talk. Medicine is a funny thing. What one experiences is not always the case with someone else going on or getting off a new medication. I would keep track of your headaches, duration etc. If in a week or so these do not subside, then I would indeed contact your doctor. Some medications can cause headaches as well as getting on a new one. With your heart issue. You are right to bring up the issue to maybe your heart specialist to make sure using a stimulant isn't damaging. Google up on internet, see what you can find out about the side effects of both drugs. If at any time you really are uncomfortable with the side effects, regardless of what its cause, call your doctor. I wish you all the best. ginnie