Hi Lisa, first of all I'm sorry to hear of your diagnosis ( small fiber nueropathy,) because having it myself, I know the difficult road you are on. I just joined this group today, and hope to encourage others and be encouraged as well. I was diagnosed 10 years ago with Autonomic small fiber nueropathy, so a short answer to your question about your bladder being affected, yes, most definitely.
With the Autonomic part I have these issues daily, dry eyes, dry mouth, constipation, diarrhea, stomach aches, gas, nausea, feeling of fullness, feeling like I have to go often, problems urinating completely, starting and stopping, at night I go literally 5 times a night whether I drink or dont drink anything . So many other symptoms as well, heart palpitations, dizziness, hearing loss, tinnitus..
Any doctor should know that your nerves are responsible for so many actions in your body, temperature, heart rate, blood pressure, sexual function ect..
So on top of the other things we have deal with, messed up pain signals, we also have to deal with our daily bodily functions being messed with.
I am believing for a cure, and lean on God to get me through until then, if you ever need to just unload your frustration ( it needs to be done or else it can be overwhelming fighting this battle) I encourage you to do so here, because those of us who have this disease completely understand.
I pray Gods best for you