I started 4 days ago using penis traction, pro extender. Is this safe? I use it at interval of every 3 hours only, rest at 2 hours and start again for another 2 hours. I can't bear the feeling of soreness at the neck of the head that's why I can't continue wearing it for straight hours. Is this normal and is traction effective? Please advise. I attached the pics while wearing it. Thank you.