W/O seeing the problem, and considering the age of the house, you might spend some $$$ to talk about someone who knows what they're doing. Perhaps a structural engineer, because the 'support' needs to permanently carry the load (most likely).
If you can do the hard work yourself, spend some of the money you save on good advice. Otherwise, you'll have more fun explaining to the insurance company what the 2nd floor is doing in the living room. (You MAY not get reimbursed ...)