Then bring him to to hospital or the doctor. He might have a temperature within 35 degrees between 30 degrees if he has a cold. Or might be worse he might have a virus as he might need to test it out. I think I have experienced this kind thing before. I think you just need to massage his right shoulder or go to somewhere where there are people that can help him to massage his shoulders, but if it gets worse then at least go to the doctor or the hospital. Or it is just he has high blood pressure or maybe gas. There are many sicknesses related to this so I am not sure which one is which, but you can figure it out. There are many ways you can fix this problem. You can allow him to drink 3 bottles of water everyday, eat fruits, eat some vegetables, drink some tea, give him medicine if he is sick, going to the doctor if the pain doesn’t stop, if it gets worse then bring him to the hospital and praying to God about fixing the problem.