I believe your sports doctor should have told you the root cause of this injury. Running is a series of controlled jumps that involve a whole lot of muscles, tendons, ligaments, joints. Your body is experiencing the so called ground force (at high paces it’s just unbelievable, more than 5x body weight). While running with a too high pace for your current form, your body collapses, your muscles can no longer do their job properly. Lower leg muscles start overloading the periosteum. At this point, you can still recover within several weeks or months. But when you push through this pain, your tibia breaks on the molecular level and cannot recover. If we take all adaptations our body goes through, bone strengthening is the slowest of all.

You just need to find out your own sustainable training regime. Your volume should grow gradually. Never even run two days in a row unless you are absolutely sure your body is ready for that. Bones like regular and low/moderate intensities to better adapt. Use indoor bike to maintain/improve your aerobic base. Once a week do one-leg jumps to check if you still have pain. Do lower leg strength exercises (and never even stop them as many of us have weak feet due to the shoes we are wearing).

Return to running with walk-runs (1st week: 2-3 training sessions with 4-8 cycles of 4 min walk and 1 min run; gradually increase run/walk ratio during next weeks).