Sorry to hear about your injury. I hope you have been able to get a professional opinion from a PT for you injury – as this will ensure you get a correct diagnosis and action plan for what you should and shouldn’t do along with a timeline for healing.
It’s important to not let an injury/niggle derail your goals. You can’t be sure that your outcome goal is now not possible – there are so many stories of athletes exceeding their outcomes goals, despite major setbacks in their training. You will want to focus on what you can do, while you let the overuse injury heal itself, which with the right approach could well be healed before your event. For now if you can do alternate sessions such as bike, swim, elliptical to replace your run workouts this will keep your fitness progressing, despite not running. This will go a long way when you can run again, as you will have not de-trained.
So for now:
1. Diagnose – don’t guess.
2. Pivot – focus on what you can do, and replace your run workouts with equivalent aerobic training, continue your strength training
3. Follow your PT’s instructions for exercises.
4. Stay positive – focus on your process goals and not just the outcome goal you wanted for your event.