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One easy test you can do with a volt meter is to check the voltage at various outlets. Compare those that are showing proper voltage against those that are problematic. The circuits that are working properly should show the same voltage at all outlets. That can vary a bit with different energy providers, but typically close to 120V, after you've checked to confirm that no breakers have tripped.

Had a similar experience in 1989 after a thunderstorm and close lightning strikes. Afterward I found that some circuits were not completely grounded, but had not been thrown.

If in doubt, call an electrician to check it out to make sure you have proper grounding of the breaker box.