How does this plan of action sound for low b12?

I just had my lab work done last Thursday and was totally expecting my B12 to be low. I have not taken B 12 and really just wanted to see if I could defy reality and keep it up without supplementation! Well, my level is 270. I believe my last level was 500(?) almost 1 1/2 years ago. I have been pretty tired and run down lately. Anyway, my PCP wants me to have 1000mcg every 2 weeks (injections)and to follow up again in 3 months to see how it is doing. Does this sound like enough? Should I also do the sublinquals? Will I suffer any long term effects from having my B12 this low for possibly a year? Michelle are you out there? Shelley

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