If all those tests come back negative and I continue to worsen, I might ask for:

A CAT scan

More tests for Sarcoidosis:

Reason--my great,great grandfather had Sarcoidosis, my symptoms fit and I have other associated diseases like Allergic Contact Dermatitis and numerous other allergies

Serum A.C.E.
dihydroxyvitamin 1,25-D
25 hydroxyvitamin-- D (25D or D2/D3)
Soluble IL-2
Lysozyme, Serum

More tests for Sjogren's Syndrome:

Reason: My symptoms fit this the best of any possibility, I fit the typical demographic that gets it, there's a history of autoimmune diseases in my family. To complete the full Sjogren's screen, I need:

Mitochondrial Antibody with Reflex to Mitochondrial Antibody Titer

Thyroid Peroxidase Antibody (Anti TPO)

From the British Medical Journal--Peripheral Neuropathy Stage 3 investigations:

These have not been covered:

Urine: Bence-Jones protein

Anti HIV antibodies

Antineutrophil cytoplasmic antigen antibodies (p-ANCA and c-ANCA)

From Neuromuscular Disease Center--Washington University, St. Louis MO. USA:

Antibody Tests for Sensory +/- Motor Neuropathy:

Reason: More possible autoimmunity

IgM vs MAG
GD1b
TS-HDS
Sulfatide
HH3
IgG vs Sulfatide

Other tests:

Infections: CMV IgG, Toxoplasm IgG

Toxins:
lead
urine--heavy metals

Reason: the methylated B vitamins seem to really be helping my mood and energy. I suspect I don't methylate B vitamins well and this same lack of methylation can cause toxins to build up in the body as they need to be methylated to be removed.