Hi,
Noted the history about a 51 year old healthy woman doing regular exercises but lately developed intense nausea, headache and pain under right breast after eating or doing strenuous hiking and exercises. The most common cause I can think about are as follows:
Gastritis related problems, GERD.
Liver or
gallbladder related problems.
The problem can be diagnosed by the following ways:
Take a PPI like
OMeprazole and antacid and see if this helps.
Ultrasonography of abdomen for gallbladder and liver related problems.
Upper GI Endoscopy for Gastritis, GERD,
esophagitis, duodenitis.
Tests of blood, urine and stool.
Examination by a Doctor can help to see is there is any associated
costochondritis or any other problems.
Once properly diagnosed get treated regularly with prescription based medications.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. T Chandrakant, General Surgeon