Hi Thanks for posting on HCM Nausea and vomiting may be caused by the same conditions.These are not illnesses but rather symptoms of underlying health issues.There are many possible causes.The exact cause may not be easy to identify given your unclear description of symptoms.You may write back with details like associated symptoms and nature of vomitus, personal history like last menstrual period,recent feeding habits... Some possible causes however may include: -Emotional stress (such as fear, anxiety) -Early stages of pregnancy -Motion sickness or seasickness -Medication-induced vomiting -Gallbladder disease -Infections (such as the stomach flu ) -Concussion or brain injury -Brain tumor -Ulcers -Some forms of cancer -Bulimia or other psychological illnesses -Gastroparesis or slow stomach emptying A rise in heart rate with intercourse is normal and feeling nauseous may set in as well. I will suggest you see the Doctor for examination and work-ups. Hope my answer will help you Regards