I can totally sympathize with worrying about being trapped by disability. I've often felt trapped in life, sometimes due to circumstances, but sometimes due to weird mental "dropping-out," which I'm now pretty sure is due to something other than SPD.
However, I was very lucky to stumble onto Stoicism relatively early in life, and it's pretty much designed for questions like this. The key thing is not to make yourself miserable by confusing what is and isn't under your control:
http://classics.mit.edu/Epictetus/discourses.1.one.htmlSince, then, we are bound to many things, we are depressed by them and dragged down. For this reason, when the weather is not fit for sailing, we sit down and torment ourselves, and continually look out to see what wind is blowing.
"It is north."
What is that to us?
"When will the west wind blow?"
When it shall choose, my good man, or when it shall please AEolus; for God has not made you the manager of the winds, but AEolus.
"What then?"
We must make the best use that we can of the things which are in our power, and use the rest according to their nature.
"What is their nature then?"
As God may please.
Recently, there's been some guy that made millions of dollars in Silicon Valley, then decided to leave it all and start writing books re-branding Stoicism as the new killer app

I personally think he's a poseur because he could have just told everyone to read the classics rather than buying his book
But don't let the messenger obscure the message; Epictetus and Marcus Aurelius are some good stuff. I've never read Seneca, but he's another big one.