Thanks. Any discomfort in the hours/days following the injection such as nausea or headaches?
I have never had any discomfort following the injection. Before I learned to self-inject, a nurse once gave me the shot. When she called the next day to ask how I was doing, I had totally forgotten about the shot!
I began my B12 regime back around 2010, maybe a year earlier or later. At this time I lived in the jungle of Papua, Indonesia. Medical care was unreliable. I was having some vague symptoms of fatigue, stomach issues, a fuzzy-creepy headache which started in the back of my neck and went upwards into my head. It wasn’t like other headaches, but really felt like a fungus growing between my skin and my skull. I realize that is a strange description, but I haven’t yet come up with a better one.
A nurse/friend thought I might have developed pernicious anemia and recommended I try B12 injections. I started receiving 3mL twice a day. In about 2 or 3 days the headache had almost completely disappeared. The headache would begin to reappear about 8 hours later. I would get another shot and short time later the headache disappeared again. After a while it completely disappeared.
I did have more energy after the shots. The abdominal symptoms disappeared. I still continue with the B12 shots at a rate of 3mL per week.
It turns out I do not have pernicious anemia. I have an autoimmune hemolytic anemia called cold agglutinin disease (CAD). While not a front-line treatment, the B12 helps and is now prescribed by my hemotologist.
HTH