Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
You did not tell if she has a past history of
migraine or any other disease. however
headaches can be due to a number of reasons like migraine, sinus problems, over-activity, long standing stress, missed meals,
anxiety or lack of sufficient sleep. These can be ruled out by taking proper medication & stress relief with a little lifestyle change. Rapid heartbeat and
nausea are symptoms that cause concern. Since she is in mid-forties she ought to have a thorough cardiac check up. She may not be having any heart problems now but it is better to have investigations done like ECG,
lipid profile etc. She may need some medications or counseling on lifestyle and diet changes. Help her have a thorough health check up for better fitness & healthy lifestyle without delay.
Hope I have answered your query. Let me know if I can assist you further.