My dad died yesterday (cancer)

Hi. Honestly I don’t even know why am I writing here but I just can’t function anymore after what happened. My dad was battling cancer for almost a year and unfortunately he past yesterday. Since then I’m so overwhelmed with this unexplainable anxiety that I cannot even washed dishes without hyperventilating or just straight up shaking. Of course I am devastated and heartbroken but this anxiety is killing me. Is anyone ever come across reaction like this? What can I do?