I want to be independent, but I get sick easily and have seizures, and then I miss work, and therefore don't have rent money or money for debt, and people are stressed by me and disappointed in me.
This is a good start. You want to be independent, but your disabilities are preventing that. If you simply begin with that goal and a positive attitude, you should be able to find supportive people to help - Therapists, Guidance Counselor, etc. These are generally good people, and are on your side. The hard part here is finding one with the time to truly help you. Unfortunately, that's not a small task. But they should be able to offer advice and provide resources to help you reach your goals.
Avoid listening to the feedback from just anyone, including friends, family, and even some of the people I mentioned above. If the feedback isn't helping you reach your goals, then it doesn't matter. Note that not all feedback will be positive, but ask yourself whether it is helping you. Like I said before, trust yourself and question everything.
Other people have disabilities, yet they come to work and pay bills. I feel like I'm failing or that I'm just lazy.
Comparing yourself to others can be a recipe for disaster. Everyone has their own challenges, even if on the outside things looks similar. Instead, I might suggest you find yourself a hero, someone that might be in a similar situation but has thrived. This might take some work to find, but having a positive role model to help you look beyond your immediate situation can be very helpful. Also, if you find that person, reach out to them. Try to talk to them. You might just find their willing to help you reach your goals.
There was also an incident in the house with my roommates last year where two of them kept treating me like trash for months, then told me everything I felt was in my head.... yet taking that advice only made me more confused and stressed.
This is a tough one, as your living with them. First question, are they still treating you like trash? If not, does it matter anymore? (i.e. is it stopping you from reaching your goals?) If no, then try to acknowledge it happened and then move on. If it is still happening or it is preventing you from moving forward, my first line of thought would be to tell them how you feel and that you want to move on. But I realize this isn't easy. Do you have someone in the house, or maybe a mutual friend who can help with that discussion?
I realize that none of this is easy, and will take time and effort to work. Please recognize that your feelings are valid, and shouldn't be dismissed by others.
You need to believe that!
Please stay in touch, as I am hoping that you can find a way out of your current situation and find some peace along your journey.