I've had a horse voice for over 6 months with an enlarged lymph node in neck. My tongue now feels numb with low grade fevers. What could it be?

Hard to know. You need to see an ENT doctor so your voice box can be looked at. 6 months is a long time and lymph nodes are of some concern.
Could be lymphoma. These symptoms, particularly when going on this long, are very worrisome for lymphoma, a type of cancer. See your doctor or an ENT specialist as soon as possible.