"Seems every country that kicks out the American oil companies suffers economic retaliation" You might want to look up how Chavez was begging funding from Chevron, amongst other, to continue funding its operations in Vz. He even asked Chevron to borrow on it's own balance sheet and lend the money to the Government.

https://www.theguardian.com/world/2010/dec/09/wikileaks-oil-giants-squeeze-chavez

"I remember hearing about shortages of cooking oil , toilet paper and toothpaste ,etc" You did. You may also have heard of thousands of tons of food rotting in Government controlled warehouses at the time. Odd thing, when you don't pay suppliers, and your cronies are busy steeling everything not nailed down, you start having shortages - who knew?

"what will the Right-wing opposition do if they get into power ?" Do what they did last time they were in power, take Vz back to having the best Social Indicators of any Middle Income country