First of all welcome to AR...I'm sure you will find all your answers here.
The first mistake you made here was going into this cycle uninformed...you need to get on an extremely aggressive PCT a.s.a.p.
The reason for your crashed sex drive is likely because you ran deca only and you should have at least included a trt dose of test @ 250mg/wk while you were running the deca.
I think it is safe to say your HPTA is crashed and you are very much "shut down".
Like I said, I would get on PCT a.s.a.p.
Now, your probably going to ask, "What's PCT"?
Start by looking here:
http://forums.steroid.com/forumdisplay.php?f=77