Hi, I have gone through your question. I am a practicing anaesthesiologist and pain consultant. The extent of internal injury is depends on the force of impact at the time of trauma. We can t predict about internal injuries without physical examination and investigations. According to your symptoms it looks like superficial muscle pain only, but still we can t neglect it. You have to undergo ultrasonography​of your abdomen to check for any internal injuries. I would like to suggest, to consult a doctor, and go for appropriate investigations. Pain killers like paracetamol and tramadol will help to reduce the pain.