Various causes of dyspepsia should be considered. This can include an ulcer, GERD, or inflammation of the upper digestive tract.
An upper GI series or upper endoscopy would be reasonable initial tests. You can also obtain blood tests looking for H Pylori - a bacteria that is associated with ulcers and inflammation.
If the GI workup is negative, you can go the cardiac route and consider a stress test to exclude coronary disease.
Regarding the hardened, tender area - this is difficult to say what it is without examination. If there is a mass in the area, a CT can be considered for further evaluation.
These options can be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
http://www.straightfromthedoc.com