--though I'm sorry about what is bringing you here.

Yes, unfortunately, many of the chemotherapy regimes have the side effect of neuropathy, especially those that involve drugs derived from heavy metals, which are notoriously neurotoxic. And the neuropathy may not only occur during the regimen, but well after.

Even some of the vertigo symptoms might be related if the nerves controlling your automomic functions were involved.

The good news is that, over time, many people with chemo-induced neuropathy do improve, though the improvement is often slow, patchy, and can be incomplete. Still, given that you've obviously been through a lot, a more extensive work-up into other possible causes might be indicated here if things are continuing to get worse. None of us are exempt from being "co-morbid" and can have conditions from multiple etiologies.

If you haven't seen it already, our neuropathy section here is very active with a lot of smart people and good advice:

http://www.neurotalk.org/forum20/