I have PN also for a pretty short time less than 2 years but I also have what you described recently as far as the GI symptoms, I get dizzy and short of breath. It very annoying to say the least and bit scary. I am currently working with my neurologist for my PN and have brought my other symptoms to the attention of my GP. She then referred me out to the appropriate specialists. For the GI symptoms so far I have only been prescribed some medication for GERD probably mainly because my throat is killing me all the time! I also saw a cardiologist which all tests came back normal. So my suggestion would be to see your regular doctor about those new symptoms and see where that goes, but of course it won't hurt to mention them to your neuro at your next appointment. I wish you all the best!!!