Shin splints or stress fracture

I just finished up my season for collegiate tennis. The season was very long, and there were very few days off. I have not done any running or any tennis for about 12 days now until today. When I tried a light jog today I had the same pain immediatly. The run only lasted about 10-15 minutes and I had the pain throughout. I have pain directly on top of my shin bone right about in the middle of my shin. I however usually do not have pain while walking. The only time I will is after a practice or a run. I didn’t have shin splints before this, and I feel kindof like the pain just popped up. I know they say it is usually a stress fractue if the pain is localized, and I have this, but I feel as though if it were a stres fracture it would hurt while walking. If I try and perform the “hop-test” I will have pain in my shin in the one area immediatly within the first jump or 2. How long do shin splints usually take to heal up. I feel like if it was shin splints it would be gone already. I am just concerned because I do need to start my summer training and there are tournaments coming up. I defintly do not want to be dealing with this next season either…

Any Ideas?