>>19869543that's actually a picture of your house then? thought it was a generic pic you found. I forget some people don't remember to never post personal info.
If that is your house. You can brace the interior of the house up with joists. I suggest using metal storm brackets to nail the different boards together with. I wouldn't trust just nailing shit when you've so much structural damage. Half the house is unlivable and that entire side is getting pulled down and rebuilt from the ground up. Home owner insurance would call that a total loss and just write a check and walk away. They wouldn't bother helping anyway.
Since its yours and paid off. Just rebuild it. A professional will have to get the local city/county to authorize various repairs depending on ordinances. But honestly fuck them. Do it yourself. Just cover all that damage up with a tarp and start pulling it all down and building a new frame as soon as possible. If the water get into the rest of the house from that massive damage its going to cause the entire rest of the house to rot VERY quickly. Especially for such a old home. Such a small simple home isn't hard to repair. But its a time vs cost issue.
You are looking at atleast 20k in material replacing everything. I wouldn't expect much of that to be reusable. But the priority is getting a new load bearing frame up and secured as fast as possible and then getting a new roof up and built, even if the rest of the walls are just tarped sticks supporting it.
If you don't get that fixed quick the city may notice and try and condemn your property. once that starts happening you are unlikely to be able to stop it, at most definetley are not living inside it. So tarp off ALL that damage as fast as possible now. Today. Like save the link here and immediately go get the fucking tarps and get that shit up. You don't want some dipshit neighbor grabbing pics and sending it off.