Have to agree and would add the following, as others have said you only get one Mum so she needs any reasonable support you can give her but she also need to face up to the level of support that you might NOT be able to give her. In short your mum needs financial help and you can't give it to her, that ISN'T your fault mate it's hers. She has some issues and she needs help to resolve them, not just from you I would suggest. She obviously wants desperately to be in a relationship and to be loved by someone but it would appear that she is preapred to "buy" her happiness, it won't happen. If you can you need to sit down with her and try to talk this through, the danger of course, is that she will throw even more blame at you if you go down the "home truths route", i.e. "how can you say all this to me at such a time as this etc etc." Unfortunately, the reallity is that this situation is mostly of her own making but it's going to be difficult to get this across without a lot of pain.
In reallity I think she needs some professional help with regard to her finances but are these problems triggered by s deeper seated insecurity/loneliness. I don't know I'm not a doctor but maybe that's the route to try and get her down after all this upheaveal has settled down.
And I have to ask when did she tell you you have to move out this weekend? I'm guessing but fairly recently? If so she really needs to get her head out of he sand and face reallity.
Sorry if this was harsh (I have made one or two assumtptions that maybe incorrect) but you did ask for opinions and I hope this gives you something to think about/analyse.