This is a public service message, sometimes endearingly referred to as a message from the "schema police:" Other people's negative experiences do not have to be your own. Although some types of meditation in a dream may lead to certain results for certain people, results may vary.
(I thought a little humor might be helpful.)

As shown in this thread and in lucid dreaming books (Charlie Morley's Dreams of Awakening most recently comes to mind), others have had positive results with meditating within a dream. Other examples of different people having completely different results are mentioned in the first thread in my signature if interested.