I found some chewable B12 vitamins that are 2500 mcg (more than 3 times the mcg I normally take per day. But I cut these in 2 and take 1-per-day- still a fair increase in my usual intake of B12 - as I feel they might be absorbed better in chewables than pill or sublingual.
http://www.gnc.com/family/index.jsp?categoryId=2166420
Also the ALA I'm taking seems to help quite a lot. Had very much improvement until yesterday, as I'm in a flareup now which seems to coincide with winter storms of ice and rain. Don't know if its coincidence or if the weather is really affecting me - it certainly seems that way.
I'm going to start a new PN thread solely about weather and pn flareups, as I haven't seen much about this. Hopefully we can figure out if this is psychosomatic or just a myth, or if there's some base in reality for weather related flareups.