How serious is my illness

Male 26 years old 6+ months of:
-Left hand/arm numbness
-hands/feet turn ice cold
-legs fall asleep while sitting on floor, in tub, or indian style
-Lightheaded upon standing
-Knees feel stiff after sitting and have to stand for 30-60 sec. before stiffness and ache goes away
-Frequent urge to urinate
-Split urination stream
-Hard to start urination
-Frequent stops during urination
-Pressure in scrotum region
-Pelvic pain/fullness (most likely from bladder retention)
-Bladder retention
-Feel like I zone out for a minute or two a couple times a day (find myself just starring at nothing)

Exams:
-Prostate exams showing no inflammation
-Prostate fluid showing no white cells
-Urine comes back negative for infection and/or bacteria
-Cystocopy comes back negative (no obstructions, growths, or narrowing)
-CT scan comes back negative with some seminal vesicle enlargement
-Catheraterized twice with 100ml+ urine retention after urination the first time
-140ml+ urine retention after urination the second time (3 days after first time)
-Potassium sensitivity test negative (twice)
-Urodynamic analysis showing great pressure in bladder very little pressure from bladder exit to tip of penis

The urologist wants to repeat the cystocopy on June 11th @ 9 a.m. and referred me to a neurologist (June 9th @ 9 a.m.) because he feels it is neurologic in nature.  With all of these symptoms is there a possibility that something serious may be going on?

Thanks for any and all replies.
Dave