Distracted and struggling to focus during the day and restless at night, what could this be? it has been 3 months

Examination: First see your physician to rule out physical ailments like hyperthyroidism. Referral to a psychologist or psychiatrist may then be in order to treat a chronic anxiety state. Cognitive behavioral therapy or stress management should be helpful. Constant struggling with anxiety and stress eventually leads to physical ailments.

Need to examine: It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated.