Hi Jessica, Welcome to Health care magic forum. You have described that you are getting this dizzyness
, muscle weakness
, and fainting
during and after upper body exercises.
Exercises usually do not have any such effects, in case of cardiac problem it will be there during lower body exercises also.
Only possibility appearing is cervical spondylosis
, may cause symptoms due to stretch on the effected segments of cervical vertibrea.
I advise you to consult an orthopedic surgeon for diagnosis and treatment. You may need to have C.T.scan for confermation of the diagnosis.
Wishing for a quick recovery even after the upper body exercises, and thanks for calling.