Testosterone level 125 - Causes, explanations ?

I am a male in 50's, suffering from all the symptoms of very low-T that are mentioned on the internet from lack of libido, development of man-boobs, severe depression, lack of intimacy / zeal/interest in anything and life itself, ED, almost no ejaculate, almost near impotency for last many years. Yes, I am on Lipitor, Benazepril, Allergy shots, Colitis meds, am a border line diabetic, etc. and over-weight, at 215 lbs. 5 ft.10 in.
   My testosterone levels got finally tested, but only when I strongly pressured my primary physician that I wanted to know what they were. He has been my Primary since about the last 10-12 years and obviously never did he catch all the underlying symptoms of very low testosterone levels in the annuals, blood and urine analysis etc.   When I was not getting satisfactory answers from my Primary Doc, I started reading up to get educated about my symptoms, issues etc. I realized that I was having these symptoms for many years but never did he suggest a Testosterone level check. Only after I started reading on the internet about symptoms and consequences of low-T did I get an explanation for what was going on inside my body and mind, causing those symptoms. Before contacting me about the results, he orders a Prolactin test off the same blood sample to cover his back, I was told, "to rule out tumors". When I told him, I had an MRI done just 5 days back for tumors, showing no problems, he was just nonchalant and says 'Oh yes, I forgot about it.'  Now, I am in my 50's and am thinking back should I not be suing this guy for negligence and carelessness over the years, for ruining my life in all areas -  sexually, emotionally, physically.