Welcome, Sarah.
I guess misery really does love company, because sharing with each other helps us all. Your symptoms, while individual to you, are not that different from things the rest of us experience or have experienced.
Hearing arthritis and nerve problems in the same sentence makes me think gluten intolerance may be causal, or at least making things worse. It's another avenue to research.
I don't know how old you are, or for how long you've been developing issues; probably longer than you may realize. Most of us are of the opinion that things really can get better; but it's going to take time. You probably didn't develop these problems quickly, so there's no reason to expect a quick solution.
Patience is very difficult when you're in pain, and when you're frightened. You do have a great community of support here. And there are truly knowledgeable members. Mrs. D. Glenntaj, and many other senior members can really help you in knowing what questions to ask your doctor.
Good luck,
Steven