Sorry to hear you had an accident. Hope you are all healed up.
My simple advice for a return to training after illness/injury is to come back slowly (reduce your sessions by 20-40%), put a recovery day between your first few sessions to see how you feel. After a few days of successful training and, start to ramp up your duration first, then add in some intensity (short intervals with long rest), and start to return to your training load after 5-7days of being intentional and listening to the body.
You will start to lose some fitness after 2 weeks of no training, but not enough that you will not be able to return to your training with a planned bridge back into things.