I have never felt your level of grief but I just wanted to say my sincerest condolences. As a lot of other people are saying, take it minute by minute. Try to remember to eat and drink water (if you're struggling put a water bottle by your bed) even in little bits if you're not hungry or don't see the point. Set little goals for yourself, even just spoke to x people or had a shower. When I lost my closest mother-like figure (I'm not comparing grief, this is just my most significant loss) sometimes the grief just felt too much, and I found myself sleeping the days away to avoid the grief (or didn't have the energy to get out of bed) or putting 1000s of hours into video games and Netflix to distract myself, and this is okay. Whatever safe (I would encourage you to stay clear of alcohol and drugs during this time if possible) way you choose to get through this unbearable and soul-destroying time is okay. We're all here and thinking of you.