According to Wikipedia, one of the causes of thunderclap headache is a condition called primary sexual headache. I think you need a doctor's help, probably a neurologist, to sort this out. The palpitations may be secondary to the headache and, if so, probably not indicative of a heart problem. But you need medical help. Some of the other causes of thunderclap headache involve serious brain pathology. Only a medical doctor is going to be able to help you with the diagnosis.
I had one of those years ago. It lasted days and wouldn't go away. I went to the hospital (embarrassed with explanation) but a Doctor told me to lay flat and he injected me with a powerful muscle relaxant. After about 5 mins, the pain went and never returned. He said a tiny muscle at the bottom of the skull was constantly in spasm, squashing nerves. The pain was severe, never had a headache like it before, or since. The pain made me nauseous and certainly got my heart racing.
This site complies with the HONcode standard for trustworthy health information.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.