From Longman Dictionary of Contemporary Englishget to somebody/something phrasal verb informal1 UPSETto make someone feel annoyed or upset I’m under a lot of pressure at work, and sometimes it gets to me a bit. Don’t let things get to you.2 get to thinking/wondering something informal to start thinking something He got to thinking how disappointed his parents would be. → get→ See Verb table
Examples from the Corpus
get to thinking/wondering something• There's blood in your body, and I get to thinking about what would happen if your blood froze.• In any case, she had now got to thinking of other things.• Then they got to thinking that maybe you were dead.• When you've been around guys like Mr. B. awhile, you get to thinking the way they think. 