I am so sorry. I just got a new guinea pig three weeks ago, and I had just very recently posted about him (and his picture) but he passed away last week. It was very unexpected, sudden, and my world absolutely shattered. He signified a new chapter in my life, and I had envisioned many years with him. He didn't get a chance to get his own song, like my other pigs have had, or even his own hideys yet. I didn't get enough pictures of him. I just didn't have enough time. I can't eat or sleep. I hold onto his blankets and just cry. Why did this have to happen? Am I being punished? I can't believe this has happened. I wish I could rewind time. I felt similar, but much worse, when I lost my first pig a few years ago that I had much longer than two weeks. When I talk about it, I feel like it sounds ridiculous, or like others would think it sounds ridiculous (I know some would,) but when I lost my first pig, I went into a year long depression.
He was what got me going every day, my life revolved around his cage and his happiness. I didn't have much else outside of him. He was my world for so long. I dotted on him, and spent all of my spending money on him. Even after I got other pigs, none of them had been as special to me as him. When he was gone, I felt absolutely nothing but grief. I turned to food and gained a lot of weight. I lost any friends I had. It was incredibly rough. I don't know how many people on this forum have gone through similar as me, but from what you wrote, I sympathize completely. I blame myself a lot when I lose a pet; it can really destroy me. Try to understand that any guilt you feel is how your brain decides to cope, but the guilt ("it's my fault, if I just hadn't..." it's not a fact or an explanation of what happened.
Allow yourself to cope in a way that feels natural as long as you're not hurting yourself. Don't listen to people that tell you to cope a certain/different way, or tell you to get over it, or people that act like it wasn't a big deal. It is a big deal, you lost your babies, and in a really awful, horrible way. You deserve to grief, to cry, to whine, to mope. Listen to your brain and your body, let yourself feel what you need to, but be careful when you try to convince yourself it's your fault. Telling yourself that won't bring them back, it won't change the past. Your babies would not want you to blame yourself. They loved you so much and I know they were so thankful for all that you did for them.
Anything you want to say, anything that's hurting you, talk to your dog about. This is the only solid advice that I have, but you have all my sympathy. I feel for you, and again, I am so sorry this has happened.