Hi there, thank you for posting your question on Ehealthforum. This is not intended as a substitute to visiting your own doctor.
Ejaculating can cause your heart to speed up a bit and lower your blood pressure a bit. This can make you feel faint. If you stay lying down and do not add to the BP lowering by standing up suddenly you should be OK. Tell your doctor you feel faint at times. You need to have your heart listened to.
Dr Andrew Rynne.
www.andrewrynne.com