Working from home has decreased bullying by bosses and co-workers. Workplace bullying often happens in informal conversations, and there are simply fewer of these when working from home. If you find that you are actually happier and less stressed when working from home, that can be an indicator that you were having negative workplace interactions you might not even consciously notice.
Keep a log of how you feel (for example in a journal, as I discussed yesterday). Start now when you are working from home, and continue it once you get back to the office. If you find that you feel worse back in the office, start paying attention to the tone of your interactions at work. There might be subtle bullying happening that you don’t notice.