I have recently been diagnosed with B12 deficiency (serum B12 131ng/L serum folate 4.6ng/ml - I am 48yrs old) and was given an initial B12 loading dose injection which I had expected at best to improve some of the symptoms I had been suffering over a number of years and at worst make very little difference. I previously had memory issues, occasional burning feet and on rare occasions numbness in my little finger and ring finger and general tiredness/fatigue but generally I was able to function pretty normally. Since having the initial B12 injection a couple of days ago I have instead experienced worsening symptoms especially tingling and burning sensations in my arms, hands, legs and feet as well as numbness in my left hand (whole hand not just fingers) along with shooting pains in my left arm. I also suddenly feel very tearful and generally unwell and very tired but I've had difficulty sleeping over the last couple of nights.
I was feeling so bad yesterday evening that I called 111 who advised me to go to A&E and after some general checks (blood pressure, pulse and temperature) the doctor advised taking folic acid but advised as it was only a vitamin injection I had nothing to worry about and there was no allergic reaction and speak to my GP.
I rang my GP this morning to mention this but did not get to my GP as when the receptionist spoke to her the GP told the receptionist to inform me that I should speak with the nurse when I come in for my 2nd loading dose injection tomorrow. My GP has already mentioned she knows little about this condition. I am now very concerned at having the 2nd injection given my symptoms are acutely worse than before the first injection. Also I'm not confident that the nurse will be in an appropriate position to advise me on what is happening to me and whether or not to proceed with another injection as I do not wish to aggravate my condition any further.
Has anyone experienced similar worsening symptoms after their first B12 injection as I'm generally reading that most people actually improve rather than worsening and I do not wish to be left with long term issues due