Hi, there, again! Linda, it sounds like your depression may be worsening. It is not uncommon for depression to manifest itself in rapid swings up and down and to be overcome by those horrible blankets of feeling sad and futile and unable to move forward.
You likely already know that MS plays nasty games with our emotions. Because it is also a disease of the gray matter and of the brainstem, we are often at the mercy of emotions.
Depending on how bad you are feeling, it may or may not be alright to wait for 10 days to see your neuro. If the feelings are getting worse really fast, then put in a call to your neuro tomorrow and let him know how you are feeling. He may want to see you, or get you on an increased dose of the antidepressant before he sees you. But, he can't decide this if he doesn't know what is going on.
And remember, we aren't "the outside world." So, let us know how you are feeling. and I mean "say real words to us." Tell us your fears and why you're sad and all. It's the best part about an anonymous forum. But, sometimes, isolating your feelings from those around you (not us) is not a great idea. We cope much more poorly when we don't have a clued-in support network.
Depression is one of the more serious effects of MS and it is not a side effect. It is a primary effect of the disease just like weakness and pain.
Do you live alone?
Here is some reading if you haven't seen it yet:
Depression and MS
Emotions and MS
Take care and let us help. 'Kay?