Anger can manifest itself in many ways. Not everyone shows anger through yelling or kicking a tire. Some people are "passively" angry - they become quiet or withdrawn. They see the silently or grind their teeth in their sleep. Anger over multiple sclerosis (MS) can manifest itself in other areas of your life. You suddenly can't stand the color you painted the garage door last spring; the doctor had no right to keep you waiting for your appointment so long; the waiter was so slow, he didn't deserve even half the tip you left him. These things might all be valid, but you're not really angry about them - you're angry at your MS.
Although these signs of anger are less obvious than others, they still reveal a need to blow off some steam. If you don't take charge of it, you'll find it will come out anyway, usually directed at someone who doesn't deserve the outburst. Misdirected anger isn't fair to the person who bears the brunt of it, whether it's your lover, your mother-in-law, or the poor gas station attendant who didn't wash your window fast enough. And although your MS diagnosis may have given you a right to be angry, the rest of the world isn't going to be tolerant forever. Identify your anger, get rid of it as soon as possible, and move on with the coping process.