Hello and welcome to Anxiety Zone!
I'm a 33 year old female and mother to three and I know exactly what you're going through. My current fear is ALS or MS as well as I'm having some tingling/numbness in my arms off and on, plus some other very annoying symptoms. It's amazing what anxiety can do to your body and it's even crazier that this is an inherited thing. It runs in my family as well. My Grandmother has always had anxiety extremely bad. My Mom not nearly as much as her but it's rubbed off on my brother and I and we're always worrying about one disease or another. Mine came to a head shortly after the birth of my 3rd child and I was a mess! I was in the ER thinking I had a brain tumor and they ran all kinds of tests on me and all came back good, aside from a few minor health ailments. It's a rough thing to go through.
Here's to hoping you get some relief from this soon. And know that you are not alone in this! It's a great comfort to me to know that others know exactly what I'm going through! Have a great weekend!