I have been experiencing a lack of concentration, no interest in doing what i usually do, grumpy, get lost in my head, no motivation at all. i have been to a psychologist in the past, refers that i suffer from debilitating anxiety. ?

Re-evaluation: Your description is highly suspicious for at least a major depression. It is always good to major sure that underlying metabolic and nutritional imbalances are handled, and if alcohol or recreational drugs are involved, these must be stopped. A sleep disorder should be excluded. Find an experienced psychiatrist and get stabilized, as you have years of potential ahead. Best to you.