Good luck! It is the best thing you can do...get help. I think it's a herding thing with some Shelties. My sister has all kinds of trouble with hers as far as running appliances of all kinds; the toaster, the microwave, the ice maker, the printer...everything. It got so bad that the dog started back chaining and getting worked up at the cues. For example: Getting into the cupboard to get a glass meant the ice cubes would start falling. So, he'd start barking and carrying on when she'd open the cupboard. Getting the bread out of the pantry meant the toaster was about to be used. I told her what to try...to break the sequence. Open the cupboard, get the glass and go watch TV. Get the bread but don't put it in the toaster. That first. Then to feed next to the appliances that she could move to other places in the house....with them off. Then on. But I don't think she did any of that and just lives with a barking lunatic when she wants to make a drink with ice in it or run any appliance. I couldn't live that way, myself. I'm too nervous as it is. LOL.
I hope this trainer will give you some good ideas that you can realistically work on. It will take work, no doubt. Or a steel building with no windows that you can lock them up in while you vacuum. LOL.