Boyfriend has horrible pain in hip towards groin area, pain worse when lifting leg, limited motion?

My boyfriend started experiencing a little pain in his hip towards his groin yesterday. He is a mechanic and he does lift heavy objects almost all day long and does a lot of repetitive motions all day.
His pain kept increasing last night to the point where he only had 1 hour sleep. I advised for him to go to the ER but he is stubborn. He indicated that the area is NOT swollen, bruised or red. Pain increases when he lifts his right leg. Pain is only on the right side and does not radiate to any other part of his back or leg. He indicated that he feels that the pain does not feel like a muscle but pain feels similar to rubbing bone on bone. He has been known to have arthritis in his shoulder, but I am not sure if this could be effecting his hip? Can arthritis spread from a shoulder to a hip? He had shoulder impingement syndrome and had to have surgery. He is also 27 years old. He rated his pain as a 7 or 8 out of 10 (w/ 10 being highest)
He is too stubborn to go to the ER so I am looking for any suggestions at all!!! Should he ice it when he gets home from work? He is even too stubborn to take off work for the day. Thanks in advance.
I forgot to mention that my boyfriend can only lift his right leg about a few inches off of the ground (limited motion).

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Tags: Arthritis, groin, leg pain, mechanic, pain increases, repetitive motions, shoulder impingement syndrome, sleep, thanks in advance