B-12 Shot

As many of you know, I have been struggling BIG TIME with fatigue. I talked with my surgeon about it and he didn't seem too concerned and figured it would go away in about 8-9 months. I can't wait that long as I am missing about 1 day of work every two weeks because I am too tired to go in. I saw my PCP today who seemed very concerend that I have lost 103 pounds and am so exhausted. She thought I should have much more ENERGY because of the weight loss. She gave me a B12 shot and wants me to have a sleep study in case the whole 'open mouth sleeping' is causing some sleep problems. For those of you who have had a B12 shot, how long before you feel a 'difference'? Rose from PA

Rose, I can't tell the difference from when I take my B-12 shot and when I don't. I haven't had my shot for the month of Sept. because I ran out and have not been able to get it refilled yet. I don't feel any different this month than I have in the past 7 months. Anna