Pain in my shin after walk 2 days ago. hurts every time i move. in my lower leg/ankle. what's wrong? what should i do?

Ortho: Sounds like shin splints which are painful but not serious. Rest ice and Motrin will help. If not better 1 week consider stress fracture xrays may need to be done if still hurting after treatment.

Low leg pain: Possible to be many things like shin splints, muscle strain, tedonitis etc. See your doctor but in meantime try ice rest elevation to see if it helps.