These symptoms do sound rather concerning, and you should definitely go back to see your primary care doctor
about them. Any time that someone has abdominal pain
or other stomach symptoms that are persistent and do not improve, this needs to be investigated by your doctor.
There are several different possibilities that your doctor will be able to consider. For example the pattern of nausea and pain in mornings may be consistent with a stomach ulcer or a problem with acid reflux. Both of these problems are sometimes worse with lying down to sleep or on an empty stomach (such as first thing in the morning when you wake up). Another very common problem that can cause intermittent stomach pain
and cramping is irritable bowel syndrome.
Furthermore, make sure that when you go to see your doctor you mention any other concerning symptoms, such as a change in the color or odor of your bowel movements, any blood in your bowel movement, any fever or skin rash, or any pain or swelling in your joints, as these might point towards a more serious stomach problem.
Finally, your doctor will be able to consider whether these symptoms might be related to a medication side effect, so make sure to bring a current list of all the medications that you are taking when you go to see your doctor.