Not diagnosed with PA hope you don't mind me adding my experience.
I'm from thyroid forum Blue horizon test showed B12 411, anyway because of tingling in hands and feet thought it a good idea to take sublingual b12 . Plus b complex having had advice he and thyroid
Well the tingling and numbness became and thing of the past 🙂 and an added bonus was that my 'burning mouth and lips' that could drive me mad on occasion also got better.
I hadn't put 2 and 2 together, so to speak, till then, but what benefit I got from advice on here and thyroid UK.
When looking back at some blood test with my GP I see that these low levels showed up then, with anaemia and other flagged lows.
Just wanted to pass on the enfo to anyone else that it might help. What it is to be a bit more comfortable in my body🙂🙂
Kind and peaceful New Year to all x