I have been reading a book about detoxification and it talks about yeasts and fungi.
I have come to believe that the yellow stuff that I first identified as flukes may be a yeast or fungi. It seems to be associated with the tapeworm that I got rid of. I am wondering if it is stored food for the tapeworm?? Who knows?!! I have eliminated most yeasts from my diet since I no longer eat any products made with flour or sugar. That has improved my health a lot.
Anyway, I am sorry to hear that you are having so much trouble. Alcohol is the only thing I can think of that might help you with your refrigerator. You can now buy alcohol in spray bottles. I use it to disinfect counters, sinks, toilets, etc. It does kill parasite eggs. Diatomaceous earth is also good for parasites. Maybe you could sprinkle it on your dog's hair or mix it in his food. Be sure to use FOOD GRADE. Ask your vet.
A really good air filter may help you too. I have one that is great. It is made by Winix and has two types of cleaning technology. If I put a musty scarf by it, it partially cleans it. If I walk by it and fart, it turns on and runs at high speed. Some reviewers of the air filter have said that when their dog sits down next to the unit, it turns on.
You can get furnace ducts cleaned and a HEPA filter put on the furnace. That way you could turn the heat back on.
Try vacuuming every day and be sure to let as much sunlight as possible into your house.
It must be really hard to be cold and sick. You have my sympathy.