Depression and anxiety are symptoms of B12 deficiency, so it could be that those symptoms will improve over time.

During my first year or so after my B12 dx, I noticed flares in my symptoms anytime I was sick or overtired. It was the twitching symptoms that I usually noticed first, but I remember thinking that stress did trigger an increase in symptoms, whether the stress was illness, lack of sleep, or emotional stress.

You could certainly be deficient in other things, too, that might be causing additional symptoms.