Mema, I'm so sorry for your pain. I would reschedule your appoint for the following week. Stay with your sister. if you have so little time, spend it with her. Librax, isn't that an anti depressant or anixity medication? I think I was on that decades ago. It sounds familiar.
you will feel better. You are under a tremendous amount of stress right now. Try and take care of yourself and maybe focus on your sister. I assume you are close? If not, keep your apt I guess. This is all a temporary setback and will get better. It takes time and none of this is easy. And the added stress of your sister is an added complication. Try and breath, try to eat yogurt if you like it. Or what about Boost. It's liquid so it shouldn't do much.
Good luck.