Fifth test needed?

Patient: I have done three home pregnancy tests which were all negative. i then went to the doctor to out my mind at rest and i did a urine test and tested negative. he also tested my blood sugar levels and it was 6.2 He assured me that i am not pregant and that i have the signs of a stomach ulcer. my concern is, that the area below my belly button is hard and i feel little flutters in my lower abdomen. is it all in my head or should i go for a second opinion? please help!