Ritualistic refers to something that is done in a way that is designed to have a special effect. Some people might use the word to describe the way that people dress or the way that they eat.
Compulsions are habits or behaviors that you find it hard to resist. They are often addictive and habitual, which means that you find it hard to stop doing them.
A preoccupation is something that occupies your thoughts to the point where you don't have time for anything else. You can have several preoccupations at the same time, and they can all be related to the same thing.
When someone is fastidious, they are very careful about the way that they dress and the way that they look. They often have a lot of standards and they are very picky about what they will and will not wear.
Irrationally is used to describe something that is not based on reason or logic. When you say that someone is irrationally angry, you mean that they are acting in a way that is not logical or reasonable.
Irrationality is the opposite of rationality. Irrationality is when you act in a way that is not based on reason or logic.
Reabsorption is the process of something being absorbed into the body again. When you eat food, it is absorbed into your body and used to provide energy.
Electroconvulsive therapy (ECT) is a type of treatment that uses electric shocks to treat mental disorders. ECT is usually used in combination with other treatments, such as medication and therapy.