Student or Learner
Does "frazzled nerves" mean pretty much the same as "frayed nerves"?
There's also the expression my "nerves are shot".
frayed - definition of frayed by Macmillan Dictionary
frazzled - definition of frazzled by Macmillan Dictionary
As you see, they do not mean exactly the same, although I would say they cover some common ground. IMO, however, "frayed nerves" does mean more or less the same as "shot nerves".
Please be aware that I'm neither a native English speaker nor a teacher.