Tibia stress fracture?

after running around 2.5 miles i have pain on a certain spot of the tibia. I run a lot but recently i have been playing soccer as well. i have had little pain there for the last month or so but now it is hard to walk. The pain is in the middle of the tibia and hurts more when i push at a certain spot. I was thinking that it might be a stress fracture and any help would be great as to what to do for it. also if anyone has been through this before and has some advice, it would be nice.