First of all, keep in mind that I am unable to diagnose you because I am unable to examine you, this forum is for educational purposes.
The most likely explaination of your symptoms are non-neurologic, including bladder sphincter spasms (that can be helped by Detrol) or undiagnosed inflammation/infection.
However, the symptoms you describe may also be related to nerve damage in the peroneal area, amongst other things. I do not know the procedure that was done for the TAH, but with vaginal approach TAH the nerves could be stretched and cause a transient pain. In rare cases the nerves may have permanent stetch damage/injury, which can be diagnosed on a pelvic EMG. Other possible causes include multiple sclerosis (an MRI of the brain can help with this) and a viral infection such as herpes simplex, etc. I would suggest starting a medication for neuropathic pain such as Elavil, neuronitn, cymbalta, etc to replace the Lortab (neuropathic pain medication takes 2-3 weeks to work, but is more effective in the long term. I would also suggest the pelvic EMG and MRI of the brain with and without contrast.
I hope this has been helpful.
Ask them for more details on what the surgery found and see if it may have been worked on, or if the catheter they used may have irritated the uretherer somewhat.
I would suggest using cranberry juice or the tabs (avail at supermarket healthfood sections) to keep your urine in good shape and keep yourself hydrated.
Fiona