My Hands Feel Hot, Sometimes Burning.

Since around February, my palms and all fingers always feel warm or hot, sometimes burning. It’s hotness, rather than tingling or pain. I use my computer all the time, and sometimes my hands feel so hot that I can’t type on my computer and I have to wash my hands with water. (But my hands soon return to feeling hot). My hands already feel warm when I wake up. When it feels burning, I think it hurts.  Orthopedic suspected Carpal Tunnel Syndrome. But X-Ray of hands and neck, ultrasound of my wrists, Phalen’s test and Tinel’s sign were normal. I don’t think I felt tingling during the tests. I can also do the O sign with my fingers. Blood test ruled out rheumatoid arthritis.  Now, the orthopedic doesn’t think it’s CTS or tendonitis. He isn’t sure why my hands feel hot. Do you think it’s really not the CTS?  Should I also take Nerve Conduction Study to make sure? What could it be? Is it some kind of neuropathy or something else? What other tests do I need? I'm taking B1 B6 B12 since April