Hello, thanks for the posting the question to H.C.M.C.
Lie down over a bed straight (supine position) and now take a deep breath and put your right hand finger over lower part of chest and when inhale press the finger in mid way at lower part of chest ,if you feel excruciating pain means problem in gall bladder may stone or infection.
In your case U/S shown stone in gall bladder so only one option is to get surgery without delay.
As your's most complaint are on the right side and over right arm so surgery is must.
Still you feel pain after gall bladder surgery
than consult a doctor and he will treat you.
Regards Dr. HET