OT/ Child walking like he has CP

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Sorry this is off topic. WE were doing IVIG ( 3 doses 30 days apart)I was waiting to start the Valtrex - after the first of the year.

We have been doing the B-12 shots and nasal spray ( not on the same days of each other).

Howeverin Dec my son started walking on his tip toes, and now its worse, he iswalking like he has CP, very unbalanced and wobbly. Falling down a lottoo. THe MRI was normal - no myelin problems, the CAT Scan was normaland shows no sign of a stroke. All basic labs are normal, CBC,Metabolic panel - IGG, IgA, and IGM - normal ranges.Now I know were faced with doing an Lumbar Puncture, but I bet we comeup with nothing, as my son has not been running a fever. No signs of virus, not even a cold!

Having to face the DR's at the hosp and tell them all that we been doing is going to raise eye brows for sure - at some point if things don't improve we will have to go for all the usual testing,

so dreading it.Anyone have any ideas?