Как это:
if not functionSomething1 then
raise EMyException.Create(errormsg_functionSomething1IsFalse);
if not functionSomething2 then
raise EMyException.Create(errormsg_functionSomething2IsFalse);
if not functionSomething3 then
raise EMyException.Create(errormsg_functionSomething3IsFalse);
// do something good