I think i have had symptoms of sepsis for weeks, but all my tests come back fine. and my vital signs are normal. what should i do?

Be grateful: You're not going to develop sepsis out of the blue without having some underlying cause that a second-year med student could pick up. If you've lost your spleen along the way, sepsis can pop up suddenly -- but you'll be obviously sick. And people who have sepsis perish in hours or days. Get a diligent physician to work up whatever symptoms you have. Best wishes.