I would worry if you were still getting anxiety attacks as that would indicate you may not be able to handle the stress of police work. They will look at your past and may ask if you have ever had such things in your past, but if you've since been able to find better ways to cope with anxiety and stress since I wouldn't expect it to be a problem. If I read correctly you were in eighth grade the last time you had that happen, so that puts at least five years between the problem and the present. As to the depression, people get depressed when people and pets close to them die; it doesn't show your weakness, it shows you love. Good luck
We must all fear evil men. But there is another kind of evil which we must fear most, and that is the indifference of good men.
-Monsignor, Boondock Saints