are:

B12 (I recommend methylcobalamin)
B6 (I recommend P5P version)
folic acid
There is an RX with all 3 activated B's in it called Metanx.
That would be your best bet.

The amounts in a mulitvitamin are very low. A B-50 would be needed at least, but would still be low in B12.

The other two things are
magnesium (not oxide form)
Omega-3 fatty acids

All five of these work to help repair the myelin that coats the nerves. They also need methyl groups which commonly come from the diet from root veggies like beets. There are supplements for this and they are called dimethylglycine or TMG trimethylglycine.

Nerves get damaged by:
nutritional deficiencies
trauma
infection, including herpes zoster and simplex
medical interventions
genetics (CMT)
metabolic derangements ~~ diabetes and hypothyroidism

I am still unclear exactly where your problem comes from.
Where the cyst was, and whether it was operated upon.

Also since you mention IBS... and since your meds reflect a Fibro treatment protocol, if you do have Fibromyalgia, you need to know that the spinal fluid of these patients typically comes up low in B12.
So you should try at least for now 1 to 5 mg a day of methylcobalamin. This is the activated most useful form of B12.
examples:
http://www.iherb.com/ProductDetails....1&pid=129&at=0

http://www.iherb.com/ProductDetails....1&pid=117&at=0
Take once a day on an empty stomach.

Many people respond right away to this, within a month.

I have threads here on magnesium, EFAs (omega-3s) and B6.
I'll bump them up for you.