b12 shots-anyone else??

well thus far i have been taking 500 mcg of b12 a day i had a 2nd round of blood work done in april and got a call today from my suegeon's office saying my b12 keeps getting lower ( now at 279) and i am not absorbing it.. so they want to put me on a b12 shot..i'd need to get once a month... they called it into the pharmacy and i'll go in the office mon. afternoon and they will give it to me.. so, anyone needing the shot too??