MS can cause Lability of emotions - I anger faster (ask DH), I cry easier, I laugh easier, but events of short duration and intensity and targets. What Manic behavior have you exhibited? Diagnosis of such disorders are a tricky area, while MS and mood swings and Depression happen, a second opinion after more behavior is exhibited would be warrented. Talk to your neuro. In his/her opinion, are behaviors within realm of MS or outside realm. Are they situational or recurring?