Are you on B12 shots or B12 sublingual?
I'm on sublingual, mainly because it's a whole lot cheaper than the shots.  Methylcobalamine works better for me than cyanocobalamine (both are variants of B12, but methyl costs about 2x as much)  If I accidentally eat some wheat and start getting sick I take an extra one.  Maybe it's my imagination, but the extra one seems to help.
Once you know what to look for, it's second nature to keep away from the wheat.  Especially once your tastebuds learn the association between that yummy garlic bread and being sick for days afterwards!
Eating out is a little harder, but oh so doable.  Thai food is my favorite, and luckily wheat isn't an issue there.
I'm willing to suffer for beer... Suffering right now with a Boont Amber Ale!
   Suffering right now with a Boont Amber Ale!
My favorite brownie mix is Cravings Place Oooey Gooey Brownies.  Their chocolate chip cookie mix is good, too.  Best pizza dough mix I've found is Namaste Foods.  (actually, Namaste's brownie mix isn't bad, either.)  They've got a pancake mix I want to try.
You can still eat pasta to carbo load, just make sure it's rice pasta.  I get mine in the asian foods section of the store, it's about 1/10 the price for the same noodles as in the GF/health food section.
Rice crackers instead of wheat crackers.  Rice cakes instead of toast.  Rice bread s*cks in my opinion, but there is a bread company <Ezekial Bread?> that makes a GF bread with ground pecans that is really good.  It comes frozen, so you just toast a piece when you want it and it lasts in the freezer for weeks.
For energy on the bike I eat Clif Shot Bloks and Lara Bars.  (Clif bars have oats, and oats do make me sick.)  I usually keep a couple Lara Bars with me in case I get hungry.
PM me if you'd like!
				
			 
			
		 
			
				
			
			
				"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson