August Already

So, August is here. The time flies by no matter where you are, what you are doing or what is happening, or not happening, in your life.
These last few weeks have gotten so hard. I realize that I am depressed, in a funk, feeling lost and can't seem to find my way out. There is a sadness, an emptiness in my life that I just can't seem to make go away. I would guess that 50% is from being 'sick' and 50% is stress but you would think that in knowing that, I could make it stop. I can't. I hate living like this. I hate remembering the way I used to be, the person I used to be and almost crying cause I miss her so much! I want to be that person again! I want to smile again, and mean it! I want to laugh again because there is something in my life to laugh about! I remember that people used to tell me all the time, "You are always smiling!" It's true, I was. Now all they say is, "Why do you look so sad? Why do you look so unhappy?" I can't explain, there are no words.
Along with all this there is an overwhelming sense of melancholy. There are people in my life that I love and are not in my life right now. I miss them! I miss them with all my heart! I want to share my life with them again and I want to share their life with them. But, I don't know how.
I feel so lost. So completely and utterly lost. I really hate it! Life was not meant to be lived like this and in truth, it is not living at all, it is merely existing among the living! Life was meant to be full, rich and happy...at least most of the time anyway. lol I know we all have our moments of sadness, of troubles, stresses and such but, geeeshhh...come on already.
So, what do I do? How do I change this cycle of unhappiness? How do I end this feeling of hopelessness and emptiness?
I don't know. I wish I did.