@chrisfd welcome Chris. I can certainly relate to your list.
Now, I’m not a doctor.
What you are describing sounds like a few things I have and others describe.
My first thought for you is peripheral neuropathy. The tingling, muscle weakness, trouble walking, electric shocks, the feelings of hot and cold, all are apart of neuropathy.
The pain in your arms, and other areas of your body could be fibromyalgia.

Any thoughts about what I have written?

Let’s see what other’s comments are.