Hi, I'm posting because I have these numb spots on my body and I don't know if they're related, if I should be worried, if it will get worse etc...

One is egg-sized on my abdomen, on the upper left on my lower left rib.
It started suddenly 2 weeks ago when I got up out of a chair and the muscle in that location cramped, with sharp pain and tenseness that went away like any cramp. But I touched it and it was numb, and continued to painfully cramp if I used the muscle in a similar way. It feels like it's the top left abdomen muscle. I'm wondering if it could be a pinched nerve? I've never had one though so I'm not sure. Every once in a while it hurts randomly even when I'm not moving, ranging from sharp and needle-like to an annoying dull pain. But when I touch it there's no feeling at all, and hasn't regained any feeling.

For many years I've also had a numb spot on my mid-left back right near my spine. Unlike the other one is started slowly with tingling. Recently it's spread to include the areas around it. Maybe the size of my hand. I'm wondering if it's related because they're almost on opposite sides of my body.

I was also told I have low b12, but I read this would cause numbness in your hands and feet? I basically have no idea what would cause this numbness.