Lower Leg Injury

Hi, my name is Andrew and i’m a middle distance runner. Last year after training hard for 6 months I had to take time off (6 months) due to a supposed stress fracture that left me with pain the inside of my right leg as I walked. Now today as I continue to train indoors, I begin to feel that weird sensation around the same area that I injured last year (medial area of my shin) . The level of pain is different, yet it still bothers me as I run.
What I’d like to know is how to distinguish whether it is a stress fracture or simply shin splints or how to judge whether I should continue or stop running before this small pain escalates to a point where I walk in pain. Thank you,-Andrew Roberts