Pursue remote, seated, quiet roles like Transcription/Proofreading with vocational support.

Given the original poster's (OP) significant physical, cognitive, and sensory disabilities (chronic pain, epilepsy, dyscalculia, brain injury, noise sensitivity, inability to stand/drive/operate machinery), conventional jobs are extremely challenging. The best opportunities lie in roles that are remote, sedentary, in quiet environments, and rely on language/organizational skills rather than heavy tech or math. Strong options include Transcription/Captioning (medical or general) or Proofreading/Editing. Crucially, OP should engage with vocational rehabilitation services for personalized guidance, job matching, and support in finding suitable accommodations and training programs tailored to their specific limitations.