I would suggest you to keep a pillow underneath your knees while lying on your back, that will help you relax Ur lower back muscles and reduce the stress on your sutures. Remember after your wound is dried and healed well, u must mobilize/release the scar so that it doesn't get stuck to the underlying tissues beneath. Of course support Ur wound for a couple of days while coughing/sneezing..
Next Steps
Follow Ur surgeon's instructions..n complete Ur medication course..
Health Tips
Overall relaxation for now is the key.