Frequent upper right spine pain.

I've been having a frequent backpain or back shoulder pain(right side) near to neck from around 3 wks.I daily go to gym and this pain occurred during gym only.As i was doing shoulder exercise,lifting 20kg weight on rod(pulling rod frm my knee to chest wid narrow holding just 6' gap in b/w my fist frm wich i grabed the rod)Sddnly i realised that when i lifted up the rod upto my chest and now releasing it upto knee der was a suddn pain or strain at back of my neck or spine to upper ryt backside of shlder. I thoght its just a normal strain & will go as i continued my gym.Den after i came back 2 home i realised the strain was becomng painful so i applied volini gel(exprd 1 mnth ago as i didnt read expiry date).Next mrning i cnt even move my body on bed wid my comforts cant get up from the bed nd was laying wid pain there.Den for 2-3 days i left gym & everyday massgd wid new volini gel for a week till it wnt off nd left shldr ex fr 2 weeks.but now wen i startd shldr ex it came back slightly