You know more about cataplexy than your MS Neurologist. It is nearly always triggered by an emotion that is sudden and unexpected.
You are in charge of your own health so it is up to you to make the decision. Ritalin is very hard on you though and is not the choice of most Neurologists these days. Why Ritalin? There are so many others like Modafinal. You could try it but it won’t be hard to get off it like Ritalin will be.
I’m also hoping that you’ve had blood studies done for Thyroid hormones, iron levels, B12 and all the other things that could be making you more tired physically.
Chin up! You’ll get through this too.