I have posted on here before, as I was diagnosed with a B12 deficiency in 2011 - had every symptom under the sun: Brain fog, dizziness, fatigue, sore lips, sore tongue, burning sensation - pins and needles in hands and feet, really dry skin, memory problems, speech problems, hair falling out in shower, feeling restless all the time etc...the whole thing getting progressively worse. I also have stomach symptoms which I think may be the reason I'm not absorbing as I didn't test positive for intrinsic factor anti-body and my diet is not low in B12. Have had blood tests for Coeliac and things like colitis but didn't test positive. I also tried B12 tablets, sublingual spray and patches....the only thing that ever really helped was B12 injections. I felt amazing after loading doses and they lasted for 3 months, I had my 3 monthly injection which only lasted a few days, then they took me off injections and my symptoms returned, which is why I began self injecting in 2012, every other day until I felt better. I had regular injections for the next 3 years and felt really well (apart from I did have flare ups of the stomach thing still). I thought the problem was solved. In 2015 after a virus I felt really unwell and thought I was having side effects from taking B12 so often for so long (I kept on going faint and my neuro symptoms came back). I stopped injecting and after a few weeks I felt well for six months. The symptoms then returned so I went back on them, after 5 injections I had dizziness and muscle weakness, but this then gave way to feeling better I realised it was probably from the drop in pottasium that some people get when they first go on or back onto injections. I felt better for six months, then the same cycle happened, (feeling well for six months, then symptoms returning, having B12 to feel better - I was always scared to inject unless I was sure I really needed to...I now realise from what people have said that you have to stay ahead of your symptoms returning to avoid these horrendous side effects as it is from your body healing and not from too much B12). I had one a month, but that wasn't enough, I just felt faint and then didn't feel better. So I started spacing the injections out every few days which was working well for 4 months, then I must have got in a mess with them as in May last year I was feeling more unwell than ever and was posting on here in complete panic. June - December I had a good six months and when my symptoms returned I began self injecting again, and towards the end of December I felt like I was going to die and I'm not exaggerating. I had chest pain, abnormal heart rhythms and generally feel really really ill. Really speaking I should have gone to A & E. I still feel extremely unwell. I have never been as ill as this before (and that's saying something....I went to my GP and went for a blood test this morning for electrolyte imbalances such as pottasium or magnesium deficiency. I have left off the B12 until I know what is happening with that. If I can correct my pottasium deficiency (if I prove to have one) maybe that is what I should do first before thinking about going back onto B12, or even if I don't test positive I am trying to build them up with coconut water, bananas etc.....I really do feel bad today....any advice would be appreciated.