Voices Around Me

I am a new bee here. Pardon me for my English.

I am from Mumbai, my mother died 8 years back and was a schizophrenia patient. In January, one night at around 2am or 2:30 am I was on my computer listening songs on my ear phones and as soon as I removed my earphones I heard the same song tune just behind me as someone was humming that tune. For a second I thought it was my mind because I was listening the same song for a long time but it was still there, someone continuously humming it. I was so scared that I couldn't move a muscle or recognize it was a male voice or a female voice. Somehow I managed to turn my head around as see and soon as I turned all of a sudden it stopped. There is no chance anyone from my family could have done it because they all were sleeping tight when I checked.

Some months later, around 3:15am when I was sitting on my computer chatting with my friends I heard a sudden clear loud "haww" right behind my right ear. I am sure it was no wind or anything but someone's voice. There is a huge window behind me where I sit but even if anyone could have been out to scare me the noise could be heard from a little distance but this one was just right behind my ear. Again there was no chance anyone from my family could have done it.

Once even felt like someone is touching my cheek and hair at the back of my head when I was in the kitchen. These days I feel like someone is always there with me standing beside me and watching me doing my daily chores. This makes me uncomfortable to be in that room, at times makes me hard to breath, I feel a sudden weight on my chest and my heart beats starts racing.

Can anybody help on this? Do you feel it's my mother or somebody else?