Pancreatic head mass

I am a 25 year old white female, 68 inches, 132lbs. I had an abdominal ultrasound due to complaints of weight loss (usually 145-150lbs), nausea and a stinging pain in the upper right portion of my abdomen near my rib cage. The pain has existed for several years (ultrasound and upper GI normal at that time) but the other symptoms are about 6 months new.
I had an upper GI a few days ago that showed a small duodenal ulcer off the superior aspect of the bulb. The same day I had an ultrasound that showed a focal hypoechoic mass in the anterior head of the pancreas measuring 1.1 x 1.1 x 0.6 cm. The pancreatic duct was at the upper limits of normal measuring 3 mm in diameter. It was noted as suspicious for neoplasm and could represent either a primary neoplasm of the pancreatic head or abnormal adenopathy adjacent to the head of the pancreas. Further evaluation was recommended with MRI of the abdomen. I had the MRI today and was told that it was completely normal.

Since the MRI was normal does that mean there isn't anything in my pancreas, there is nothing wrong with me and the ultrasound was false? Is the MRI the deciding factor of whether something is there or not? Are there any other tests that can give a definitive answer? CT scan?

Is there any significance in my pancreatic duct being normal but on the upper limits of normal in relation to where the mass was in the head of the pancreas?

All my lab and blood tests were normal. My TSH was 0.3 uIU/ml. Which I understand is normal but is the lowest that is allowed as normal. Is there any significance?

I feel a little pain primarily on the right side but I also feel a lighter pain on the left side. Is the location of the duodenal ulcer in the superior aspect of the duodenal bulb close to the head of the pancreas? Could the ulcer have been what they saw on the ultrasound based on it's reported location? How could this be if I have two separate feelings of pain in my abdomen?

I am still having these symptoms, what do you suggest I do now?

[KjFlicka]

I had a similar mystery 'mass' on the head of my pancreas. They found it via CT scan and then proceeded to biopsy it via upper endoscopy. It turned out to be a pseudocyst. I know the location was in such a place that could cause a lot of discomfort as it actually pushed on my bile duct. Just an idea.....