But Hanabusa Aidou was tired and weak for several days prior to losing his control. He attempted to hide it so he didn't worry anyone precisely because he's never lost control before this. You aren't the same as him and the proof is that you are already bringing attention to yourself and your fears.
Do you actually have a reason to think you've come down with what the others have and need quarantined? Are you feeling any different than normal? If the answers are yes, then do whatever you must to ensure the safety of others. If the answer is no, then theoretically you should be quarantined at all times because today isn't much different than any other day for you.
You deal with this every day and are in tune to what you are feeling precisely because of your fears. You are the only one who can determine how risky you are at any given moment and take the precautions before you get to a point where you know you can't handle it. I'm pretty sure that's something you probably already do without the need for quarantining yourself. But if that's what would make you feel safest right now, then that's what you need to do.