I saw your post and just wanted to say I have the same symptoms almost constantly. No medical practitioner has been able to pinpoint why I might be experiencing this, but it is a reported symptom of many neurological and immunological diseases and disorders, including Fibro (and anxiety), and can be a side effect of medication. (It has taken consults with umpteen medicos and many hours of research to arrive at this conclusion).
I used to get very worried about this set of symptoms but I've realised that doesn't help. Nowadays I just manage it by just being careful about picking up anything (I drop things often) and when getting up or sitting down etc. (I get numbness, tingling and burning in my legs and feet as well and sometimes fall flat on my face when getting up from a sitting position or out of a car 😂).
My suggestion would be to certainly try all the helpful suggestions others have put forward and keep trying to find a diagnosis. If other more obvious things are ruled out, an MRI and nerve studies (usually ordered by a neurologist) may give you a picture of how well your nervous system is functioning and whether there are any deficits that are causing the symptoms. Your doctor will also certainly want to rule out the more insidious diseases that these symptoms sometimes reveal (and I imagine already has).
Similarly, there may be a link with rheumatoid arthritis - I am also on medication to lessen rheumatoid symptoms but in my case (e.g. not necessarily in yours) the numbness etc seems to be greater the more tired I am, so I treat it as a sign that I need rest, and manage it with very gentle physio (ankle and wrist turns etc.).
The other thing that is useful at the outset is to keep a diary of your symptoms and when and how often they occur. Its boring and tedious but if you do it for a few weeks/a month it gives you and your medical practitioners a really good picture of what is going on, and you may find some patterns emerge. (I found pain increased after eating meals with gluten in them, for example!) There are lots of symptom tracker apps available that will email report results to your doctors.
You may of course already be doing all that - so please ignore all these suggestions if so ... just thought they might be useful.
Best of luck 😊