Seems common that people at the end of treatment seem to need, and feel better with, some vit D, and B12. I've seen lots of people go through treatment and it really varies- and perhaps depends what meds you took. But, big changes have happened, like you say, had it a long time, and is not uncommon to slowly feel better over 2-3 months afterwards. You might bounce back. Hope so, take it easy, it will happen.
Genotype 3 30 years, 2x treatment interferon/ribavirin non responder. Cirrhosis 17 years. Fibroscan, decompensating, 40 down to 22 by 29/3/16- now down to 6.5, normal, no cirrhosis. Started Buyers Club Sof/Dac 14 Nov 15. SVR 12 29/0716