I am sorry you are so frustrated. Please be happy about your clean MRI. I can't tell you how I hate MRIs.....they always mean bad news for me. I begged to skip my yearly one this summer so I could have some denial about my progression.
I know this is frustrating but it really is very good news that you have no lesions showing. Certainly get a second opinion, if you don't think you have a neuro that is taking you seriously. Rhonda has given you some very good advice. Remember that if you go into any doctor saying, "I am just sure I have MS" you have a pretty good chance of not being taken seriously. My advice is always to just state your symptoms and see what they have to say about it. I know you think you know what MS looks like but you could be going in the wrong direction. Researching things on your own is not a replacement for a medical degree.
You may want to try a neuro-urologist on your bladder issue. They can check so much these days. They are very good at testing for and treating neurogenic bladder conditions.
Please let us know how you are doing. Again, I am sorry you are left with no answers. I hope you are feeling better real soon.
Gretchen co-moderator MS board diagnosed with MS July 2006