you should start with essential fatty acids. Poor dietary intake for a long time
with your eating disorder can damage the nerve sheath (insulation) which is provided by fats in the diet. Vits B12, B6 and folic acid work with EFAs to repair nerves.

Normally fish oil is enough, but you may need Flax oil and evening primrose in the beginning as well to repair. Start at one cap/day of each, you can take up to 4 fish oil if you want unless you are on blood thinners, or have a clotting disorder, or low platelets.
Magnesium and zinc also are needed. Zinc is a cofactor with selenium in thyroid hormone conversion, and if you are not utilizing the T4 your thyroid makes, then swelling in the ankles and joints occur-- it is a tissue hypothyroidism---because the T4 is converted to T3 with zinc and selenium in the enzymes there.

A high potency multivit may be enough, or you could take them separately.

Magnesium blocks NMDA pain channels, and can afford some pain relief. It is necessary to convert Omega-3 fats (flax)in the diet to useful fats your body needs for repair.

So you need to limit sugar intake, and concentrate on good protein, and good fats.

I have EFA, Zinc and magnesium threads on our Vitamin forum.

It takes time to repair, so be patient.