Having auditory hallucinations, Again..?

I'm having examination stress now and I've been hearing ringing and then voices and random music. First, something feels like it's blocking my ears and the voices and noises come. I thought I was just tired but I sleep normally and I thought it was just a common thing that happens before sleep, but i guess now it's happening anytime and I am starting to have difficulties differentiating real noises and noises i hear.