B12 Recovery. Could this be my baseline?

I am a 25-year-old vegetarian male with long-term B12 deficiency (likely around 10 years). Last year my B12 level was 70 pg/ml and oral supplements did not help. This year my level was 155 pg/ml and I started B12 injections: 6 alternate-day injections, 6 weekly injections, followed by 2 monthly injections. My latest B12 level is 1168 pg/ml. Before treatment I had insomnia, stuttering, confusion, memory problems, and depression, which improved significantly after injections. My sleep and clarity are now much better, and I am able to understand clearly and focus for about 45 minutes or so, but then I lose interest. My question: Now that I am about 4 months into treatment, I feel emotionally flat with low motivation to study and no urgency, whereas earlier I was driven more by last-minute pressure and stress. Is this expected during recovery, or could this be my baseline?