I don't think your pressure gauge is working. Usually when you have no water you have 0 pressure. And the salty water says the softener must have been in regeneration when the laundry was running and that possibly ran your well dry.
Check the time of day on the control valve. If you didn't do anything and then you get water, you ran the well dry.
Too much water in the salt tank means the unit isn't able to suck the water out of the salt tank. Probably due to a loss of water pressure or, loose brine line connections, a kinked/blocked drain line or, injector or injector screen in the 255 valve.