You can consult a lawyer about your medical issue, presenting to your lawyer whatever evidence you have of your medical issues while in jail, as well as documentation from your current doctors of the injury you suffered as a result. If there is no evidence that you suffered a seizure in jail, no evidence that you suffered any injury as the result of a seizure, or no evidence of either, you will have a difficult time finding a lawyer to pursue the issue.

If the jail records show that you were taken to a doctor, there will also be records from the doctor reflecting examination and treatment. If there are no such medical records, that's something you can discuss with the lawyer who is evaluating your claim.

You can also discuss your treatment while in jail, the jail's description of your behavior, and whatever evidence exists that pertains to alleged behavior problems, with your lawyer. If the jail has surveillance video, that video is likely to either support your version of events or the officers'. If video supports your claims but undermines the officers', you will have solid evidence to buttress your credibility.

But you need to act expeditiously, as if there is video odds are it is destroyed after a defined period of time if no issue is raised during that time, and that time may be very short.