Welcome to Sober Recovery.
Sitting in the waiting room of a doctors office for three hours is boredom. What an addict, 28 days clean, who's thinking of using calls boredom is usually their discontent with living clean and sober.
Early recovery is hard. You are going to have a lot more downs than ups in the coming days and weeks. But don't let your addiction justify using to "relieve boredom" because in the end, you are just going to be thrown back into the throes of addiction again.
I'd rather be bored.
Stay strong, you'll get there.