Had cauda equina, nerve pressed, did surgery but still got urinary retention, week before did MRI which was fine. Why I am suffering having normal blader?

It may take time. The neurology of bladder function is rather complicated. There are multiple centers in the brain and the spinal cord that control bladder function. It may take time before function is fully preserved. A consultation with a neurologist is your next step.
Inflammation. The surgery likely caused some inflammation to surrounding nerves (expected and to some degree unavoidable). It should improve if that is all it is; i would talk to your neurosurgeon about appropriate timing of improvement.

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Nerves pressed, had cauda equina, did surgery, bladder not emptying, repeated MRI & found little fluid collection. Doctor order nerve conduction test. Why?

True true unrelated. My guess is that the nerve conduction test was to see if you had residual nerve damage from the initial problem. Surgery can relieve the pressure but the nerve damage might take up to 2 years to heal - or not heal at all. The EMG was likely to assess the extent of the problem to direct further therapy. Ask your doc why, too. Read more...

Had neurogenic bladder due to cauda equina syndrome. Is there any chance that botox can help reduce urinary retention, urgency problem? Should I try it?

Talk to urologist. Assuming you have an atonic bladder causing problems with initiation of urine, or overflow, Botox would have no value and might even cause worsening. If you suffered urgency incontinence, might be useful. Urodynamic testing can determine the precise bladder dysfnctn and guide therapeutic intervention. Read more...
Give it a try. Botox can relieve symptoms of neurogenic bladder, particularly spasms, retention or urgency. It needs to be administered by someone with experience or it can worsen issues. Good luck! Read more...

I am 24 years old, my nerve damaged due to cauda equina syndrome, did surgery but still bladder not emptying. Will my bladder get its function back?

See a urologist. Hard to predict eventual outcomes, as nerve-bladder function is quite sensitive. However, urodynamic studies might provide insight as to the status of recovering nerve fibres. Also, there are meds available to assist urinary function. Possible that you may improve over a few months as healing proceeds. Read more...