Rehoming my Doberman

9 months ago I got a Doberman she was 5 weeks when I got her the person who had her had about 6 female Doberman they needed to sell I ended up getting the last Doberman named "River" she will be exactly 9 months of age on the 17th of this month. I am living with my dad right now and I will be leaving soon to go into the military and go into basic training my dad cant keep River because his girlfriend and her kids are highly allergic to dogs so he has to sell her and give her up I was told this a week ago and I have been crying my eyes out since I got the news. My dad has found a family with a lot of land that has 2 boys that are 7y/o and 8y/o this means that family is going to bond with MY DOG and she will forget me I'm going to miss her so much. I feel an emptiness in my chest and my heart hurts this is like having a loved one die. I have been thinking of suicide recently because of this I don't think I can go on living without my dog. I don't know how to really explain the pain that is in my chest, the best way I can describe it would be an aching emptiness of sadness that I can never fill. I have been feeling extremely fatigued just not having any energy to do anything this whole week, every time I hear myself cry I cry some more it is a never-ending cycle of pain and sadness, I cant talk to my dad about it because he just says "There is nothing we can do" and when I try to talk to my mom about it she says "I don't want to talk about your father" (talking about my father because he will be finding the home for her). My dad also has a friend with a farmhouse with no kids just a wife and husband that have horses and a dog so if she goes to this farmhouse I will be able to take her back in the next 3-4 years. So to sum it all up I have to rehome my dog don't know who the family is it yet but if they have kids I will mostly never be her owner again, but if she goes to the farmhouse I can get her back within 3-4 years, I have no one to talk to about this problem and pain I'm going through, my head is spinning and my emotions are crazy at the moment so this is why I'm writing this down on the internet because no one will listen to my problems