I just gave all the kittens away and I'm crying, please help ='(?

Here was the story, about a month ago, while I was at work, my roommate went outside to get the mail and she found a box of kittens on the doorstep, and they were all very young, and crying for their mom and food. The previous owner even dropped off a letter on the doorstep saying that he can't take care of them, and asked if maybe we could keep them company until they are able to get adopted, because he just couldn't handle taking care of them for the next few weeks, and that all of those kittens were 3 weeks old at that time. Erin decided to take them in, since she doesn't wanna be cruel and just leave them to someone else. I got home from work to see kitten food, kitty litters, toys, etc. and finally, I saw Erin with 7 small kittens on her lap on her bed, feeding all of them kitten milk from the bottle, and I was shocked to see that, and I asked what happened, and she explained everything, and I said OK, but we can't keep them in here, but we have to take good care of it until they are 7 weeks old to give it away for adoption. But as those weeks went on, we both grew very attached to all of them, in the end, I was more attached to those kittens then my roommate has. I had names for those kittens. They were Tabitha, Zoey, Blue, Cinnamon, Rocky, Skyler, and Snow Angel. My favorite kitten was Snow Angel, those kittens were all so adorable, small, and very sweet. At one point, I wanted to keep one of them, but I couldn't. I already have a 10 year old dog and I couldn't afford to keep all of the kittens. It's very sad, but I just gotta do what's best for the kittens. So last week, once all of the kittens turned 7 weeks, I posted an ad on craigslist giving away kittens, with an adoption fee of $25. I never knew how fast they would all be gone to their new permanent homes. Oh man, as soon as that first person said she was coming to pick up one of them, me and my roommate said a tearful goodbye to the kittens, because one or more are gonna be in their new homes. And I cried, cried, and cried. I cried everytime if the kittens are given away. I could tell that the kittens are all gonna be loved in their new home for the rest of their lives, because their new owners loved, LOVED the kittens. I could just tell right there that it's genuine. I tried not to cry while the new owner is visiting their pet, but it's just so touching, and heartwarming that I broke down many times, but they just comforted me and told me its gonna be alright, that I will always check up on them and see how they're all doing. An hour ago, I just gave the last kitten away, which happens to be my favorite kitten, Snow Angel, to one of my closest friends, that lives a few blocks away from my apartment, I really miss those kittens. I do. I cried when I had to give all of them away and I'm still crying now. Erin hasn't cried that much since all the kittens were given away but now I'm still crying. I will always have them in my mind, and my heart, and no other animal (besides my dog) will ever touch my heart like these kittens had, and the fact that all of them went to great homes makes me feel even more sentimental. Please, how can I make myself feel better? ='(.