Perhaps another page out of a CBT workbook could be helpful. I myself need to work on my ''discounting the positive'. In other words as someone else suggested try to see past situations where three has been positive. But also look into your future and see times it could be positive. For instance, three meals a day is an example. I read too that assessing our thoughts to consider the advantage and disadvantage to our thinking can be a good way to realising our thinking must change. I don't mean the problem, I mean to our thinking. How is thinking negatively about three of benefit to you and how is thinking it is negative a disadvantage. Could it be possible then that thinking negatively is hurtful in the end.