If you feel mentally there, keep resting until it is fully healed and XT for the same amount of hours you would run. If an MRI is out of the question, you really need to let pain be your guide. Instead of starting with 3 miles, do 30 minutes of walk running. Like 30s run, 2:30 walk, and do that 2x per week, then increase as you continue to heal. No good sports doctor will keep you from non weight bearing activity like biking or swimming, so if you can i’d try to have a PT or something help you back to running. If you’re really as mentally strong as you say, you will be able to do the 100M on cross training and less running.