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What you're describing sounds like depression, which is a common comorbidity with MS. My depression manifests in one of three ways: I'm weepy, I'm withdrawn, or I'm angry and crabby. Depression can be situational (a reaction to an adverse event), or systemic (physiologically or psychologically based). In our case, it's typically systemic and physiological - a physical disease that affects our mood.
When I'm depressed I always forget to take time to get out of my own head. I am my own worst friend when I'm depressed, hanging around with myself just makes me crabbier. But, when I force myself to have coffee with a friend, write an email to someone, or just hang out with my neighbor's dog, I feel a little less owly. Sometimes, for me at least, just the novelty of doing something different make me feel better.
If you're interested, I have a metric tonne of coping mechanisms I've honed over the last 20 years of fighting with depression. Let me know if you wanna chat more. And remember, depression is not a dirty word, it's something we have to deal with just like spasticity, incontinence, pain, and vision issues.