Middle of last year I was diagnosed with PA. The symptoms came on fast. I was 38 at the time. Ater several blood tests, they were able to determine it was PA. I received a B12 injection once a week for 4 weeks and then went to the once a month. It was wonderful not having the symptoms bothering me anymore. They all but went away. After some months I noticed the symptoms returning within days before my next scheduled shot. He decided to give me more B12 at each visit and that seemed to help for a while. Now I'm back to getting the symptoms back about every 3 weeks. (Numbness, tingling, sandbag feel in the back of my head, fatigue and balance problems) I know that stress will bring these symptoms on too. My question is; Will there ever be a time that I won't have to deal with symptoms at all or is this common?