Suggest Remedy For Severe Pain And Discomfort In Legs

I Did a 15min run on the treadmill and thn went swimming straight after.I pulled a muscle in both my legs below th knee, i massaged thm better an carryd on through the mild pain.Soon after i had a throbbing pain in the crease between the top front part of my leg. Its causing me severe pain and i cannot walk without feeling severe discomfort, especially when walking on an unlevel surface (e.g. Stepping up or down from the pavement)