Celiac disease is an autoimmune condition where gluten triggers your body to attack itself. One of the parts its known to attack is your nervous system. Most of your symtpoms, legs moving, speech slurring, are best explained by a neurological issue.
While my neurological issues are far less severe and don't react nearly as quickly as yours are, your smelly urine reminded me very much that I used to, before being gluten-free, need to change my underwear twice a day because it would just smell too bad. I never pinpointed the issue, but I always thought it was vaginal discharge, but that also used to be much worse too.
In any case, if you do have celiac disease where your body is damaging your nerves, (which I would say it is), it's very, very important you be super strict about your diet. Different tissue heals differently and unfortunately, the nervous system isn't known to good at repairing itself.
It's possible that you won't test positive even on a biopsy, yet you still have celiac neuropathy.
A peer-reviewed summation article that goes into depth about this stuff. It's long but as far as papers go, it's an easy read.
I wonder how common the urine smell is? I've only heard of it anecdotally, but some of the other 'probably msa' people I know also have this symptom. smell is still gone... Saw my gp yesterday, he was floored at my improvement over last visit 6 weeks ago. Said last visit I had the parkinsons mask and a grey colour, and i had so much more expression and colour and energy. Having an off day today tho, have to use my walker continually, balance is off and left leg is dragging, eyes watery and sensetive, nose runny. I'm still getting the hang of this, i had some fries that i thought were ok, but were probably contaminated from frying chicken or something. I think i best not eat anything unless my own two hands have prepared it!