Uneven, sloping floors

sadjet

I bought my current house July 2018 but as I was recovering from eye surgery,  my sister and her boyfriend got their friends in to do the work. Whilst installing a chimney, I believe they have damaged a load bearing wall as the floors on either side slope towards the middle.  It is an old house but now my door is rubbing on the floor which is a new thing. The floor looks rippled and is starting to slope further.  I've bad eyesight and recently had a double heart attack which I'm still recovering from. They charged me 24 K and everything is done by cowboys. My sister has told me shes ripped me off and now I dont speak to her. Her friend rewired my house, fitted a boiler but not registered.  There was a fake gas safe sticker on the boiler. The floors are causing me stress and I think I might have a third heart attack.  If anyone can help me or tell me who can, I would appreciate it. I live in west Yorkshire and am going downhill with this.  Your advice and help would be appreciated.  Thank you.