Sick Day Hell: Forced to Work While Struggling to Breathe

Sorry for the sob story post, I just have to tell someone about this. Whenever I'm off sick for college (High school) my parents treat me as if I'm having a day off. I have grade C oesophagitis and GORD so it happens fairly often. Recently I inhaled strong chemical fumes for approximately seven hours because I have a very limited sense of smell. I got 2 hours of sleep and woke up to my heart beating very fast for being at rest, and I was struggling to breathe. I tried to leave the house but when I was tying my boot laces I stood up and my vision went black and I had to sit back down. I sat there for about half an hour unable to breathe well and my heart beating way too fast. I knew had to stay off that day. My mother came home from dropping my brother off at his school and asked why I was home, I explained and she looked at me as if I was lying to get a day off. All day I was made to clean and cook for my mother. I had to clean the fireplace and take the ashes out to the bins, I then had to collect logs and kindling to light the fire, all whilst breathless and struggling to stay standing. I cooked dinner, fed the dog, did the dishes and made tea all day for my mother. I was vomiting stomach acid up that tasted like what the cleaning product smelled like. I now have to lie down in my cold 4°C (39.2°F) room because my family has turned the heating off due to the high cost of electricity. I will most likely have to go to college tomorrow as my parents get angry if I take too much time off sick. I don't know what to do when the time comes.