It looks more like a neuropathy.
Numbness at the tip of fingers and toes suggest of peripheral neuropathy
Causes could be nutritional deficiency- Vit B12, B6, B1 and E.
Autoimmune conditions like -RA, lupus, Drug induced, infective, metabolic, Diabetes
In your scenario-
it looks more like RA induced Peripheral neuropathy. and weakness is due to atrophy of the nerve ending causing muscle weakness
things to do-
Tab. Vit B12 once a day.
once in the night.
Avoid touching hot water, milk, utensils.
Use footwear always.
Avoid hot fomentation, wax bath, moist heat.
Use protective measures before doing any work.