I think you should report this to your doctor.

Here is a link to the website Drugcite.com which organizes FDA adverse reports in easy to understand graphs:

http://drugcite.com/?q=spiriva

You will also want to make sure you are inhaling correctly. If you deposit the drugs more on the membranes of the mouth, instead of inhaling them the way they are designed, then they get absorbed and go into your systemic circulation and can cause many more intense side effects. If this is the case, you would see more dry mouth, blurred vision, difficulty urinating as a side effects too. You can discuss this with your pharmacist and/or doctor to make sure you are using the inhalers correctly. (Many people do not use them properly and this is very common.)

There are many drugs that can cause neuropathy:
http://neurotalk.psychcentral.com/thread122889.html

A common family of antibiotics, fluroquinolones, can do this...as that link explains. If you took these drugs for bronchitis or pneumonia in the past, they could have damaged your nervous system at that time.

You could ask to try another steroid inhaler. Azmacort for example. It has an extending chamber supplied with it to prevent the powder from landing on the inside of your mouth.
Or you can buy a "spacer" for the Flovent, and try that. Azmacort uses a different steroid, and so if you are intolerant to the Flovent, it might work better for you.