MS & LHON

Hi, I'm a 44 year old female and have been diagnosed with multiple sclerosis since 2001 from a small town neurologist.  I have been seeing a retina specialist during this time due to optic neuritis.
I recently changed neurologists @ WVU and he is testing me for Lebers Hereditary Optic Neuropathy.
I haven't recieved the results on LHON yet.
What I have read on LHON, instead of having MS it may be LHON Plus??  I am having trouble with numbness, spasticity, memory loss, tingling and gait as well as some loss of eyesight mostly all on the left side.
MRI of brain doesn't show very many lesions and hasn't changed much in the last 6 years even though I am progressivly worse.
Is it possible to have both diseases?
Thank you.