Hi,
You need to consult your physician keeping in mind the multiple symptoms taht you have.
You could get a urine pregnancy test home kit ,and check whether you are pregnant or not.
The other problems would then need to be handled, you would need antispasmodic medications and a course of antibiotics for your diarrhea. You should eat and drink well to replace the losses.
Cold sores generally clear up without treatment in seven to 10 days. If you experience frequent bouts, your doctor may prescribe an antiviral medication to treat cold sores.
The fever could be due to the suppressed immune state. 98.3 is normal body temperature.
About the gallstones - discuss with your doctor about the further plan of management and whether surgery would be required.
Follow up with an endocrinologist for the grave's disease.
Let us know if you need any other information.
Regards.
check out the pregnancy forums - there is lots of activity there. And to answer your question you could be pregnant - what you saw could have been implantation bleeding.