If ur poor, ur child gets diagnosed with horse & mold allergy & ur 200y.O. House is filled with horsehair plaster, some mold, what can u do?

Try allergy meds. Obviously, it is not possible to rid your house of all of its plaster. I would, however, do your best to remediate the mold situation as best as you can. If the mold is accessible, with proper protection, you can scrape and bleach the moldy areas to kill the mold. If your child is having daily allergy symptoms then you could try one of the otc allergy meds such as zyrtec, allegra, or claritin (loratadine).