I make no claim at knowledge especially compared to the vets around here (maybe one wil chime in and help out) but I'm in a similar situation - 40, 5'10", 191 and counting and have recently been told my test is borderline and awaiting further results.
I had decided to cycle before I had gone to the Doc who wanted to run the tests based on symptoms. I'm going nowhere quick no matter how much I change it up and wanted to get a leg up.
I've done assloads of research the past two months and it definitely sounds to me that proper PCT was your downfall from the first cycle. After a cycle your body goes into an extreme catabolic state and without proper Post Cycle Therapy and without the help of your own bodies testosterone production you will lose what muscle you have gained. Check this out:
http://www.*********.com/steroids/Po...%28PCT%29.html
and then head on over to the PCT forum and soak it up.. great guys here with tons o' knowledge..
Enjoy and Good Luck!