I have studied your case,
As you said there was no injury/trauma to your wrist.
As per your history there is possibility of De Quervain's tenosynovitis
like USG and TENS
will help in relieving symptoms.
Avoid twisting activity of wrist.
Till time continue your medication.
If not relieved local steroid
injection will help, you can take that after consulting your treating doctor.
Another probability of carpal tunnel can be considered in which there is swelling over wrist .There is nerve
compression near wrist which leads to pain on movement.
Hope this answers your query. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries.
Wishing you good health.