Lisa
Without knowing you, I guess my only question would be, How good is your Rheumy. Is he one who takes his/her time with you and really listens? I hope you have brought this to your docs attention. It is a very common problem with AS, inflammation flare and fatigue. The never ending battle. Many here are taking meds like Embrel, Remmicade and such and sometimes they get some of their energy back with these meds. Also, not many docs use vitamin B12 shots anymore, but for some they really help. I had one a month for about 2 years and they really helped. The doc that used to give them to me retired and I stopped seeing his practice. I'm thinking about asking my GP if he will start them back up again. Taking oral B12 is not the same, it has to be an injection. If all else fails, find a good health food store, a reputable one, and talk to the people there.
Hope you find some answers. If you do let us know as we are always looking for ways to fight the old fatigue beast.
Cindy