Job Struggles Due to Health Condition

I'm 28 but will be turning 29 soon. And throughout my life I've had only 4 jobs. And all of them I've not kept all because of my health and brain condition. The job is either too hard, I started getting headaches, or they got too strenuous for me to keep so I had to tell my boss I had to quit. And I know that doesn't look good on a professional resumè. (I can't help that though). So my question is...Are there other people like me out there going through the same issues I'm going through? or am I the only one? I've met only two other people who have Hydrocephalus like me but they were able to maintain a steady job far longer than I have...which 1) confuses me and 2) lowers my self-esteem. I would just like to know at least ONE person who is having the same difficulties and hardships as me. Alright, that's all. [insert Charlie Brown's sad expression here]