From OMIM
Myoclonus-dystonia is a genetically heterogeneous disorder characterized by myoclonic jerks affecting mostly proximal muscles. Dystonia, usually torticollis or writer's cramp, is observed in most patients, but occasionally can be the only symptom of the disorder. Onset of the disorder is usually in the first or second decade. Symptoms often respond to alcohol, and patients may also have psychiatric abnormalities (Valente et al., 2003; Schule et al., 2004).  http://www.omim.org/entry/159900

From MedlinePlus Genetics
Myoclonus-dystonia is a movement disorder that typically affects the neck, torso, and arms. Individuals with this condition experience quick, involuntary muscle jerks or twitches (myoclonus). About half of individuals with myoclonus-dystonia develop dystonia, which is involuntary tensing of various muscles that causes unusual positioning. In myoclonus-dystonia, dystonia often affects one or both hands, causing writer's cramp, or the neck, causing the head to turn (torticollis).

The movement problems usually first appear in childhood or early adolescence with the development of myoclonus. In most cases, the movement problems remain stable throughout life. In some adults, myoclonus improves with alcohol consumption, which can lead to affected individuals self-medicating and developing alcohol use disorder.

People with myoclonus-dystonia often develop psychological disorders such as depression, anxiety, panic attacks, and obsessive-compulsive disorder (OCD).  https://medlineplus.gov/genetics/condition/myoclonus-dystonia