Hallucinations, nightmares, sadness.

I am a 1st year mbbs student. I have been having hallucinations for the past 1 year, along with frequent nightmares, and unexplained bouts of sadness and crying. The hallucinations are both visual and auditory, and I hear breathing sounds, knocking doors slamming shut, and someone mumbling even when I am alone. I see shadowy human figures, at times upon closing my eyes, at other times with my eyes open. I also have frequent nightmares about varied themes, and I am really anxious and jumpy all the time. For a little more than a month, I have had an allergy, breathing difficulties, and eye pain, and there was no improvement despite multiple visits to the doctor and taking medicine as per the doctor's advice. The hallucinations have been there for a full year, and my parents don't understand the situation. Nobody I know has such experiences, so I have no support system. Please help me, because no one understands my problem. Please advise me on how to get rid of these things in my head.