Dealing with Chronic Pain and Emotional Support from Family

I currently live with my parents (no other option really with being single and as sick as I am,) and they are so supportive. I’m very lucky. But they are also very emotionally connected to how I’m doing, so if I’m in pain they are more upset and mad. Of course I understand this is happening to them too and they are absolutely entitled to feel how they feel, but them being upset does not help my pain. Now I’m starting to wonder if the only treatment that was starting to help has become less effective. I really don’t want them to know though, because their negativity makes everything worse. So I’m trying to hide my pain when I know they expect me to be doing well. Hiding it is exhausting and I can’t keep it up long. Any advice on how to handle this situation? Or anyone else out there feel like they have to hide their pain?