Hamlet Act IV

Hamlet is now just insane.  Everybody has found out that he killed Polonious, his friends don't know how to help him and are still on the way from London.  Ofelia has gone mad as well as she can not control who she is and now Laertes and the king plan to poison Hamlet.  Essentially it seems that each person has a vendetta on the other and are about to go on cycle type killing sprees.  As wells as, Ofelia and Hamlet's mother are still just like "deer in the headlights" lost beyond belief as Ofelia is in circles over Hamlet and Hamlet's mother awkward love for both Hamlet and the king puts the story in a pickle where I feel her decisions will ironically be the last and most important and I wonder how it will turn out in the final act.