Hi Connolly,
Symptoms of B12 deficiency tend to develop slowly and may not be recognised immediately. As the condition worsens, common symptoms include:
Weakness and fatigue
Light-headedness and dizziness
Palpitations and rapid heartbeat
Shortness of breath
A sore tongue that has a red, beefy appearance
Nausea or poor appetite
Weight loss
Diarrhoea
Yellowish tinge to the skin and eyes
If low levels of B12 remain for a long time, the condition also can lead to irreversible damage to nerve cells, which can cause the following symptoms:
Numbness and tingling in the hands and feet
Difficulty walking
Muscle weakness
Irritability
Memory loss
Dementia
Depression
Psychosis.
You need to check with your doctor what your Folate (B9 or folic acid) level is. There is a complex interaction between folic acid, vitamin B12 and iron. A deficiency of one may be "masked" by excess of another so the three must always be in balance. Folic acid works closely with vitamin B12 in making red blood cells and helps iron function properly in the body.
It is not uncommon for some symptoms to appear to get worse before they get better as the B12 you are having injected gets to work repairing the damage done to your nervous system. Be prepared that some symptoms may improve rapidly but others not as a lot will depend on how long you have been deficient.
Dou you have any idea why you became deficient? Are you vegan/vegetarian, had gastric surgery, on medications such as Proton Pump Inhibitors, antacids, Metformi, antidepressants etc which can affect absorption? Do have have a family history of P.A? Do you have other diseases such as diabetes or thyroid problems? How old are you? Have you recently had surgery using nitrous oxide as an anaesthetic?
There are so many reason for developing a B12 deficiency and depending on the cause for yours that will determine how long you will need treatment.
The "loading doses" should continue on every other day until there is no further improvement according to the N.I.C.E and B.N.F guidelines. You may wish to mention this to your nurse or doctor. You may also want to ask to have your "Intrinsic Factor" tested to determine whether you may have Pernicious Anaemia.
I am not a medically trained person but I've had P.A. (a form of B12 deficiency) for over 45 years and I'm still "clivealive" at 75.I wish you well