You taking up the immense responsibility of dealing with a disabled parent isn't something an idiot should guilt you into hating. Your mother is ill, and is depending on you to survive. If someone puts you down for helping her, for being 'that guy that lives with his parent', they are obviously retarded. Your mother needs all the support she can get at the moment, and you are providing her with it. Don't let a friend discourage that. I'd rather have someone who doesn't know the full story, judge me, than feel bad that I still live with my parent. If, on your salary, you choose to move out because of 'he say she say', you're just adding on to your problems.
Since her hearing is coming up shortly, you need to pull as many hours as you can get. I realize finding a job is difficult, especially in the economy we live in, but it's not impossible. Try moonlighting with petty jobs that aren't exactly dignifying, but they pay the bills. If you took up a per time job that isn't too strenuous, you would at least be able to afford some care for your mother while you're away.
Since she was denied in the past. You should try as much as possible to discourage a recurrence. I've had family file for social security disability, and they were successful because they took proper procedure. The smallest details counts, and they want to make sure the disability is genuine. They send you a packet for what you need to bring, and make sure she fills everything properly. Don't try to fancy anything up, it will be perceived as dishonesty more than desperation. Make sure your doctor has seen, and approved that it is actually an illness. This would be your strong point in your eligibility. If you have a medical professional verify that she is actually suffering from the stated injury, it will help your case a great deal. An optometrist would be appropriate in this situation.
Since the Social Security officers aren't going to feel sorry for you, and the possibility of rejection is there. Don't gain false hope. You will get results based on the effort you put in. Processing will take a while, so as I suggested earlier, prepare for the days ahead. Learn to budget. Learn to ignore ignorant comments. And learn to be strong.
I'm sure you'll pull through.
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]BrB