Depending on your girlfriend's injuries (and yours) you have a great personal injury case. It does not matter that he is a cop. My law partner prosecutes personal injury cases. 1-877-996-6849 http://www.WinThatCase.com
Your lawyer is likely withdrawing because likely you have no case. You need 2 things for a personal injury lawsuit - liability and a minimum quantum of provable injuries, called "damages." Without those 2 prongs, putting a case in suit would be a waste of time. That another lawyer dropped a case is a red flag to the next lawyer to stay away. Since your lawyer dropped the case you can contact the insurance company pro se and see about settling.
This is a gross over reaching by the cop he essentially gave you 2 tickets for the same occurrence in violation of NYS and Federal Constitutional protections. While there is no plea bargaining in NYC, I would certainly move to dismiss at trial as the Constitution still applies. You need to retain counsel and forget about your photo evidence because their does not need to be a posting - your defense lies in the law not in the facts. Don't go it alone retain counsel - it will save you money in...
Yoga? What kind of doctor is that? You need a neurological consultation, orthopedic consultation, and MRI's at this point to make a clinical or differential diagnoses of your condition and come up with a proper treatment modality.
Likely if no lawyer is willing to pick it up there is not a liability case against the medical provider. For an injury case you need 2 things: liability and damages. It sounds like you have damages but not liability. In a medical malpractice case the mere fact that there was a bad outcome does not mean that the medical services providers were negligent; i.e., breached a duty of care owed to your son. So it is most likely that you have no case despite the brain trauma.
"Pro bono" lawyers coming to the rescue are things of television drama. You have your pro bono lawyer he or she has been assigned. If you are unhappy with your lawyer you need to pay to retain counsel. And with the charges you are facing you should do what you can to put together at least $10,000 for counsel that does a high volume of felony DWI defense. Or do the best you can with what you got.
You are correct most lawyers are not interested unless there is a broken bone. So if you can find out who has the liability insurance on the property, contact them, and make a claim for your out of pocket, lost wages, and pain and suffering. If you cannot do that sue the homeowner in small claims court for the maximum amount allowed. Best of luck!