It's a good idea to see a rheumatologist and get checked, including blood tests, x-rays, maybe MRIs, for arthritis and other conditions. Arthritis and bone issues like bone spurs show on x-ray, but bursitis and tendonitis do not. You need MRI for those. Blood tests can show inflammatory indications for rheumatoid arthritis and other conditions.
My hand surgeon (trigger fingers) has me taking 100 mg vitamin B6 daily for carpal tunnel, neuropathies, hoping it will help my fibromyalgia. I was taking a B complex, but he said read the ingredients - it only had 2 mg B6!
I've been using my computer mouse on the left side, wearing a wrist brace, doing some carpal tunnel hand exercises, but they only seem to keep things from progressing worse.