How can I find a medical expert witness for my medical malpractice case when i can't find a lawyer to take my case because i'm on social security dis

In 2011 I went to the hospital by ambulance with stroke like symptoms. they evaluated me and decided i wasn't a tpa candidate and kept me for observation. They didn't even give me an asprin or monitor my vitals until I had another attack 4 hours later which showed I had had a stroke and brain aneuryism and blockage to artery on right side of my brain. They insisted for the rest of my stay I just had a migrain and would give me nothing for pain. I left the hospital not knowing i had a brain aneuyrism and did not find out for 4 months later. I was unable to get out of bed without falling for 2 years, My eyesight has gone from -.25/+1.25 to +350/+4.75, The major nerves in my right arm and leg are dead, I still fall alot due to a loss of balance, recent cta shows aneurysm is stable, I used to drive 200 miles to see relatives now I can only drive about 15 miles. I don't believe my doctor even looked at the second cat scan. Other doctor provided wrong list of meds.