I am not a medical professional, but i have had the same symptoms that were in my case caused by me slouching too far forward. This forward slouch stretches those nerves that go around your shoulder and on the outside of your elbow and down to your fingers. Get your shoulders back. There are a zillion exercises to help you do this. Look in the mirror, stick your chest out, and put your shoulders back.
Bicycling unfortunately adds to the fun, because it's forward posture too.
While sitting, get on your sitbones and straighten your back.
Good luck, this is hard work and it has taken me years to fight my very long-term slouching habit to the point that I no longer have the tingly fingers.
Don't get me wrong, I am still fighting slouch.