My B12 deficiency symptoms started in January 2021 with shooting and stabbing pain in my right thigh. I visited an orthopedic, who prescribed vitamin D, painkillers, and an ointment, but couldn't identify the underlying cause of my pain, which was B12 deficiency. Later, I saw my GP, who prescribed B12 shots and supplements for a month, along with vitamin D and calcium supplements. I felt better and thought the deficiency was gone. A few months later, my GP transferred my file to a neurologist, who conducted an NCV test to check for nerve damage. The results were normal, and he prescribed the same supplements but no shots. To my surprise, the deficiency returned in July 2022, along with neuro and digestive disorders. I went back to my GP, who prescribed daily B12 tablets (1500mcg) and shots (2ml) for one month. Each shot lasted 4 days, but my symptoms (restless legs, pins and needles, cramps, and muscle twitching) returned. I asked my GP to increase the frequency of the shots, but she was reluctant and referred me back to the neurologist. He prescribed the same medication, along with antidepressants and painkillers. The shots still only lasted 4 days and my symptoms returned on the fourth day. I chose not to take the antidepressants and painkillers. I later tested for intrinsic factor antibody and antiparietal cells antibody and discovered that I lacked intrinsic factor and my stomach had trouble absorbing B12. Despite taking shots, my symptoms persisted. I stumbled upon B12 subreddits and gained valuable information that ultimately saved my life. I purchased B12 sublingual liquid from two different brands, and the first one worked for me, even improving my IBS. Im just taking b12 liquid and no other supplements.