Hello, According to your history the possible causes of your symptoms are: -Migraine headache which can present with severe headache with nausea can be triggered by stress and strain hormonal changes, etc. Sometimes intercourse can also lead to a migraine type of headaches which will usually subside without the need of any special medication. Avoiding triggering agents and adequate sleep with a well balanced diet can help in relieving the symptoms. Simple analgesics can also help. -Pelvic infection or urinary tract infection because of unprotected intercourse. Which can present with abdominal cramps, nausea, etc. Your blood pressure is almost normal. If the headache persists better to consult your physician once get an examined to find out the possible cause of your problem. Hope I have answered your queries. Let me know if I can assist you further. Take care Regards, Dr. Sree Gouri SR