Alone, Lonely, heartbroken,sad ,crying all the time

Hi, Im 54 yrs old I had a best friend for over 30 yrs. I have helped her raise her 2 kids to adults and then helped raise 2 of her grandbabies for the 1st 12 yrs of their life. We are no longer friends as of March 2015. I have moved a few towns over and her daughter has taken her kids totally away from me. I lived and breathed for those kids. I picked them up every day from schoo. I bought them things they needed and didn't need. I adore them. Im heart broken and its now been 6 months since I have seen either of them. I cry every day and day's like today I just lay around and wonder why Im even here. I have been changed from one antidepressent to anthother. I go back to Theorpist a week from Monday. She says I also have ADHD and is going to put me on medictation for that. Its seems all I want to do it stay at home and feel sorry for myself.
It didn't help that during the huge depression I SHOPPED and got myself into a major hole .
Anyways Im back on prozac and a new pill to be added for the ADHD all I can do is pray that the meds help cuz right now I feel like I don't belong anywhere and noone would even care or miss me .
Thanks
Renee