This is all so crazy. And I know how much that broken foot had been bothering you to begin with. I am so sorry this has happened to you, and you have every right to be angry. The last year or so has been shitty for you and there's no denying it. Hopefully this year will be one of the worst in your life, so from here on out it will only get better.
First I want to say that being a historic building does NOT exempt you from ADA requirements. They have their own set of slightly different rules to follow, but handicap accessibility is always required. There may be some crappy loophole they are hiding behind, but maybe not. When you get a lawyer I would ask him about this.
Alright. I think that you should look at the positive side of this. For a while now you have been living in a place you don't like, with a job you hate. This is your chance to start a new life. You can do whatever you want from here. This is an opportunity that you have to take. If you need to live with your mom for a while, do so. There is no shame in that, especially if it is because of a situation like this. Don't be afraid to ask for financial help from her either for relocating, the fees that you will face, etc. if she has the resources. It's not ideal, but she is your mom and if you need her to take care of you for a while, that is okay. It does not mean that you are worth any less or that you have no independence. Independence, more than anything, is a state of mind. Everybody needs help sometimes, and one day your mom may need help from you, so you will have a chance to repay the favor.
Now, about relocating...do it! If you really don't want to live with your mother any longer, or you decide to stay with her until you're feeling better and then move, either way you need to get out of L.A. That place is killing you, physically and psychologically. I second the moving to Sacramento suggestion.
If you want to stay in California there are millions of places to go besides the Bay Area and Southern California. The Sacramento Valley really is a great place, especially since it has a huge variety of settings (urban, suburban, foothills, by the Delta, rural, etc.). It's not THAT far from SoCal. I also think that Arizona would be an awesome choice since you would be closer to a family member. Wherever you go, don't be afraid, just do it! Do you really want to live in L.A. forever? As much as you love your boyfriend and family, you have to be able to come home every day to a place that you enjoy and feel safe and comfortable in.
And along with moving, you abosultely NEED to find a new job. See if you can telecommute with this job you have for now, but figure out fairly soon where you want to move to and start looking for a job there immediately. Honestly I think that ANY job would be better than the one you currently have. And if you are moving to an area with cheaper living expenses then you can afford to take a crappy job at first while you look for something better. It doesn't have to be something you love, it just has to get you away from L.A. as quickly as possible. You can always continue searching for a job once you get there.
It may seem like too much work to do at this time, but I think that if I was in your position I would enjoy having this kind of work to get my mind off of the negative thoughts. I could see myself getting really depressed over a situation like this if I didn't put my energy into turning it into a positive change. I don't know if you will feel the same, but you might.
So stay positive. It is terribly unfair and horrible what happened to you, and you should definitely pursue justice. But how would you feel if you never received justice for what happened AND you were still unhappy in L.A. with your crappy job. That would be devestating on all fronts. But imagine that you were living in a place you loved with a job that was at least acceptable. Losing your case in that instance would be sad and unfair, to be sure, but you would at least have other things in your life to look forward to and be happy about.
Look to the future, to where you want to be, and change your life for the better. If something like this doesn't compel you to do that, nothing will. Get better soon, good luck with your legal battles, with moving and finding a new job, and STAY POSITIVE!
