It sounds like you are suffering from serious paranoia rather than hallucinations, though this is equally hard to deal with, and I really sympathise with your situation. Are you recieving professional support? Could you maybe talk about these issues to a doctor or other professional? I know it would be extremely difficult but they might be able to really help you get your thoughts and fears back on an even keel.
In the meantime, something I've found helpful is to either
a) Rationalise the fears/paranoia. For example writing down all the reasons it would be impossible for my fear/feeling to be occurring e.g Nobody could impersonate my mother because I know her to well or My psychology teacher will be at home with her family/eating her dinner/whatever and anyway she has no interest in watching me study. Or slightly simpler, just repeating to yourself 'these are irrational fears, they are not real and they cannot hurt me' over and over until you feel calmer, this will gradually seep into your subconcious and hopefully calm the anxiety.
b) Another method many people find useful is Grounding. Here is an article I wrote a while back explaining the basics of Grounding. This is a technique usually used to avert flashbacks, but it can also work with situations like yours:
First off, you need to try and take slow, deep breaths. Concentrate on the air going in and out of your lungs. If you can try and imagine the air going out as a negative colour for you, taking away all the negative thoughts and feels you have, and the air going in as a nice bright happy positive colour. Once you have managed to focus on your breathing, turn your attention to something in the room. It doesn't matter what, it can be anything, a windowsill, a table, a hairbrush, whatever.
Try and work your way through what your senses are telling you about this object: what does it look like? does it have any unusual features? what colour is it? remember: don't let feelings about the object come into this, such as: i hate that **** table, or i should have washed that mug out god im useless-you are just noticing.
Now go onto the next sense, maybe hearing. If you tap the object, does it make a sound? If so what kind? Is it loud? Does it sound hollow? Then onto touch (this is the important one for grounding yourself). What does the object feel like to touch? Run your hands over the edges and surface of th eobject taking in whether it is rough or smooth, are there any dents in it, and so on. Then, if you don't feel too silly, see if it smells of anything. Even wood has it's own smell, and it can really help to ground you in reality, away from the flashback.
Hope this helps,
Katy.
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