Accused of using drugs in workplace bathroom [Michigan]

Accused of using drugs in workplace bathroom. Now what?

Two days ago my manager asked to meet with me. Once in his office he said, “This is off the record. I know you have been smoking pot in the bathroom. It’s okay with me. This is off the record”. I told him I was not using drugs in the bathroom. He doubled down and said yes, I know you are. 3 female co-workers (who there is ongoing existing conflict with) “verified” this also. This is a multi stall women’s bathroom, for the sake of this conversation. He said that one day this week he went into the women’s bathroom after I used it (huh?!) and also thought he could smell something. I demanded that he call our corporate HR office, something that does not happen at my office, because I wanted someone else to hear the accusation. He called the HR representative, said I have an emergency on my hand. I have so and so employee here with me and I’ve made a big mistake. He then explain the situation at first saying that he asked me if I’ve been smoking pot in the bathroom. I corrected him and said no you accused me and he acknowledged that was more accurate. I expressed that I didn’t know if I could continue to work for this company under these circumstances (there are many more incidences like this, but not as egregious). My manager expressed to the HR representative that I’m in pain due to medical condition and that is why it must’ve been me using drugs in the bathroom. The HR representative obviously apologized on my company’s behalf told me to take the day and think about it and see how I felt tomorrow Tomorrow is today, Friday. I emailed my manager and the HR representative this morning and advised that I was taking a personal day today. I’ve heard nothing from the company that I work for since walking out of the office yesterday. I have no idea how to move forward from here. I’ve put a few calls out to attorneys to see how I should move forward. I’m concerned about this manager and these three coworkers continuing this rhetoric and gossip to other coworkers and people in the industry I work in. Any advice in advance of hearing back from an attorney? AND, no I was not smoking weed in the bathroom or anywhere else