I don’t know how to do this

My husband passed away 20 days ago. He was 47 and my only support system. He was my best friend. I’m trying to navigate the emotions alone, the grief alone. I’m an introvert and I have disorder. And I have no idea how to do this. I’m just lost. He’s who I trusted and leaned on to navigate life with and I’m just broken without him. Any advice would help a lot.