These are just my thoughts. Obviously, I'm not a doctor so keep that in mind.

When did the numbness and tingling start? Did it start right after you or during the time you were on antibiotics? If so, what antibiotic were you on?

Vasculitis can cause some dizziness, numbness, tingling, pain, etc. Hopefully, the specialist can help with that. There are other autoimmune disease that can cause neurological symptoms as well. In some people, RA can have neurological symptoms.

Lesions may or may not show up on MRI. Some lesions are too small to detect or are there but not in that particular slice on the MRI. MRIs are 1/4" slices and a lesion could certainly be hanging out in between the slices. But, it will eventually show up in another MRI. As my neuro said, damage is still taking place behind the scenes and may not show up for a while. Hence the reason he wants all his MS patients on some sort of DMD.

Some medications that are used for RA can also be used for MS. My neuro listed them off for me but I can't remember what they were other than methotrexate and Rituxan (which is a biologic). It's just something to keep in mind as there are crossover medications that you can take.

Your blood work looks normal but as Starz mentioned, the ratio of things can be out of sync and be causing a problem.

Keep in mind, some diseases take a while to be diagnosed. The answer will eventually come. Just be patient, keep a symptom log with the date, how long the symptom lasted, did anything bring it on and did anything relieve it, etc. It will help keep you on track and you may see a pattern emerge.

Good luck and feel free to ask us any questions while you are going through this.