live, or exist forever? brain stimulation?

If the brain is a battery, a receptor and transmitter of electromagnetic pulses, that it means everything we touch ,see, feel, think,etc, comes from electric pulses and brain waves created or interpretated by the brain. Now lets say it would be possible to keep the brain running after ‘death’ by supplying it with blood/oxygen, and having some nodes or microchip or whatever keep an electrical pusle running through….this could keep our conciousness active….or, at the very best, we could almost ‘rpogram’ this electrical currents to stimulate the brain and create some virtual reality, then we interpret the same way as real life…….

alternate methods would be :battery in the brain, replace organs, gene therapy.
developing technology that allows us to travel at relative speeds….so we age slowly.

Please give me a “virtual reality therapy” scenario..?

We’re learning about therapies in psych class, and i don’t understand this therapy..it says in the text it’s used for too expensive, difficult or embarrassing situations to re-create.. and there is an example in the book, of someone who is afraid to fly…but i need other scenarios
Thanks