I am so sorry Flours! Hope you can tell you have a sudden and strong headache and take a taxi back home, or whatever place you can enjoy some snack by yourself. If you are going much to the bathroom, maybe they will buy in (can you tell you have stomach flu/)
Sorry I am not being good here, I just want you to have some solace, I have been there.
And you are not a bad person! you are not choosing to have this condition right now