I'm sorry to hear that people aren't respecting your needs by turning down/off the TV when you're visiting. It sounds like you respond a lot more strongly than most to sensory input and particularly the combination of visual and auditory styles used in TV and movies. I definitely do not respond as strongly as you, although am still quite sensitive to visual and auditory input.
Could you clarify whether you're seeking assistance with managing the sensory input, or in trying to explain the impact it has on you to other people (so that they don't have the TV on in the background, for example)?