I am not aware of a connection between the ovarian mass and gastroparesis.
To further evaluate the back pain and urination, you can consider a CT scan and ultrasound to further evaluate the kidneyes. The urine should be sent off for analysis to rule out diabetes and infection.
Musculoskeletal etiologies of the back pain can also be considered, via an MRI.
These options can be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b