sorry we cant diagnose your problems. it is you that must tell us what your mental disorder is and what your problems are. all we can do is tell you whether we have had the same problem as you describe.

if you google the symptoms you wrote about you will see that your problem can be any of thousands and millions of disorders, diseases and such.

my suggestion contact a treatment provider ie medical doctor, therapist, psychiatrist. they will be able to tell you what this is.

I have stared blankly at walls, and other objects. with me it was medication problem.

I know others that have done this. with them it was hallucinating, catatonia, psychotic reaction brought on by stress and panic and anxiety reactions.

I have never felt like in your words a "malevolant being is trying to take over my mind" but I know people who have felt this way. with them it was medication reactions, stress, psychosis, hallucinations. the same wit your discription of an entity taking over your mind..

Again only a treatment provider can diagnose what your problems are. my suggedtion contact a medical doctor, psychiatrist or therapist. they can do tests with you that can diagnose the problem and get you the right kind of treatment you may need.