Hello.
Thanks for posting your query at DoctorSpring.com
Lets start with CTS carpal tunnel on both sides is more in favour of RA.
Morning stiffness and pain in RA distribution again goes with RA. test 6 years old patientback were negative but you require Rheumatoid factor, anti CCP, TSH, ESR CRP, ANA, vit D assay ASAP.
Your occasional pain can be palindromic onset RA predominantly affecting knee as in your case. Your age is just 44 years old patientquite unlike age for OA.
It will be better if you meet a rheumatologist directly and get the evaluation done.
Regards.