Hi everyone, hope you are enjoying the sunny weather? A quick question please ... has anyone suffered from B12 / folic acid deficiency while in AF or on Warfarin. I have been in permanent AF for 8 weeks now and on warfarin for the same time. Had some tummy troubles and blood tests revealed the above. Is it a coincidence? The combination n of both has exhausted me. I have days where I can literally do nothing.