I have a TV hysterectomy and removal of L ovary and tube over a year ago, suddenly I have been having fairly severe low abd. pain and some intermitten light bleeding. I am not sure wheter or not this is something that I should be very concerned with.

With your surgery being over a year ago, any bleeding or spotting is considered abnormal. There is a broad differential for the conditions that could cause bleeding. Regardless, you should be evaulated immediated by your primary care physician, surgeon, or gynecologist. A physical exam is warranted to determine the cause of the bleeding. Additionally, radiographic imaging such as a CT scan of the abdomen/pelvis to evaluation for any anatomic deformities.