I think, Kate, that you would get better and faster improvement with oral B12.... 5mg orally each morning on an empty stomach (no food for 1 hr).

There are recent studies showing oral works, as long as it is used correctly. It works for me! Others here have posted success too.

Injections only stay in the serum for 72 hrs. Oral provides B12 daily and is similar to eating it in food. Our bodies are tuned to that oral route. You will want to get methylcobalamin form, for best results. This is not expensive, and you can find it at iherb.com or Puritan's Pride. (I tested out the Puritan's form recently and my blood work showed it worked wonderfully).

I would add magnesium to your list. Either SlowMag or a good chelate (like glycinate). Magnesium is critical for getting fats metabolized properly, including your fish oil.