The person who is best qualified to understand the factors that contribute and take awat from the diagnosis is your neurologist.
You do describe inflammatory neurologic symptoms separated both in space and in time (different parts of the central nervous system at different time points), but you have normal imaging and lumbar puncture. This does mean, that if the diagnosis is correct, you have relatively mild MS.
So, what are the risksof treatment with Copaxone? Very low and it may be "worth it" to proceed. Of course, you should always consult closely with your doctor and perhaps seek a second opinion with her help.
No matter what you feel, TRUST IT because you have experienced it---whether someone else believes you or not, tuck it in your mind and chalk it up to the MS Weird stuff. The way I always figured it (and I was very along much of the time) there are nerves all over our bodies and myelin can break down anywhere and thus cause ANYTHING--and it does, given long enough.
MS makes for weird symptoms--that's the nature of the disease--don't let it make you doubt yourself! Hang tough-believe in yourself and your ability to fight even this mentally. Many have done this and you can too-write me anytime, and good luck! Cheers! Jane in Indiana