Hi am new here too PC just joined today, primarily for depression, anxiety, self esteem issues, among many other issues, but while I am not a religious person by any means, i am very spiritual, and open an attuned to things, and my surroundings, and pick on the little details some might miss, I personally have not experienced your current situation with the three sets of things. But have come across in my life others who have, while i truly do not know what that means personally, i can only tell u a story that comes to mind from a former co-worker. he was an older gentle men, and he always like you saw things in 3's, he used this to his advantage, and proceeded to play those 3's he saw in our states lottery, and i kid you not, he won every damn time, lucky sob. Or was it luck?? One instance he saw 3 birds on a billboard, and played 3's, and won. his highest winnings were about 20,000.00, so not too shabby to play on his instincts.
Well that was the story I had to share, may have absolutely nothing to do with your situation, but I felt compelled to share as it reminded me of that gentlemen i knew.
i am sure if you Googled your experience you would find plenty of stories out there claiming to have your answer.
But just beware and take everything you read out there with a grain of salt, take what you need, and leave the rest. that is how i have been getting by lately, in nearly all of life situations.
Good luck, and hope you find your answer or clues as to why things have been appearing in 3's for you