1. Eventhough you didnt depict your symptoms clearly, right arm pain has nothing to do with your heart. Yes, as you said, your doctor would have taken xray of chest and ECG do rule out any major cardiac problems before doing hysterectomy
for you. So, there is nothing to worry about your heart.
2. Initial pain in arm
, now on radial side of wrist, radiating to elbow / upper arms can be due to cervical spondylosis
which usually presents with neck pain
/ numbness / weakness in upper limb.
3. Xray of Cervical Spine
and Xray of Right shoulder can give us some clue regarding your problem.
4. I would suggest you to get yourself examined by an orthopaedician thoroughly for your pain in right arm.
Get well soon