Baby refuses to sleep alone all of a sudden

Ellie

I don’t know what to do. My 7 week old all of a sudden refuses to sleep alone in the bassinet. I’m going on 32 hours with no sleep at all because he won’t sleep. The second he is put down he wakes up and fusses until I hold him. I can’t take it anymore. I’m so tired. Why won’t he sleep by himself all of a sudden?!