Welcome to NeuroTalk:
(NOT Dr. House, however)

Well with all that, let's do basics:

1) Get some Lifeway Kefir and drink 6-8oz a day for 2 months or so. I bet you'll love it and it will fix quite a bit for you.
Antibiotics, and nasty things in the GI tract etc.
http://www.lifeway.net/Products.aspx
This is delicious, and not expensive and far better than most
probiotics. 12 strains of different bacteria to recolonize your GI tract after the antibiotics.

2) get a quality magnesium product, a chelate. Do not use Oxide form as it is not absorbed. Blood work for magnesium is not useful unless it is very very low or very very high. In between...is no man's land as far as if you need it etc. Serum testing is next to useless for the midrange results. Intracellular testing is more accurate...such as SpectraCell.
Most whole foods that are high in magnesium, people do not eat in the US commonly.
Here is a website to see what you are actually consuming:
http://nutritiondata.self.com/
Pay attention to serving sizes.
Aim for 200mg elemental daily to start. Here is my magnesium thread:
http://neurotalk.psychcentral.com/thread1138.html

Get a B12 test and Vit D test, and come back here with the numerical results. Most doctors do not interpret the results accurately, and labs will report very low B12 as "normal". So you should come back here with the results.

Muscle twitching is common during low blood sugar times. Also common when magnesium is not optimum.
I've seen figures that claim 70% of HYPOglycemic people have twitches during the low sugar times.

Binging on Oreos? Lots of sugar there! Craving perhaps, because you are actually having lots of lows during the day?
You can have a small snack with some protein, before bed and see if morning twitching is less. That would be an answer for you of sorts.
I prefer Zone Perfect bars, as the protein content is balanced with carbs in those. 1/2 bar is often enough.

When you say --- some red cell production problems? What test showed that? Are you anemic or borderline? Do you have test results to share? Say, MCV from your blood work would tell me something.

If you have serious Candida issues, you will have lots of odd nerve pains/etc, because the aldehydes released by Candida into the blood stream are irritating. Candida may improve with Kefir. If not, there are blood tests for it now, and you may need Nystatin oral suspension to get a handle on it so you can squelch it with the Kefir better. But the Kefir may do the trick, as it is very very good.