Shoulder pain may be a cause due to your Weak muscles , so continue your Physio sessions is the pain is severe for another 5 days , then start your neck ROM & strengthening exercises , shoulder ROM and Shoulder Stabilisations exercises
Next Steps
Start up with your exercises along with your Physio sessions
Health Tips
Keep ur muscle relaxed as much as you can , do not strain it. Train your muscles properly by performing the exercises in accurate way .