Hi Jannaw, it really shouldn't be left up to the patient to decide whether you need more testing or not, your neuro is suppose to be looking after you and if you complain of more symptoms they should do something about it, not just say " its just more PN symptoms " thats a pretty slack neuro i my book, gezz, some of these so called specialist make me real angry.
I would be looking for a neuro that is a good PN specialist thats really willing to try and help you and work in with a Rheumo to be tested for all tests that need to be done to try to find the cause of your problems.
A few years back i was on very high doses of a drug that made me a real sweet tooth and i started to really stack on the weight, the way i got around this was to eat fruit & chew sugarless gum, instead of going for the sweets, it worked for me.
good luck
Brian