You should definitely contact a medical malpractice lawyer. These cases are highly complex and you will need another doctor to testify that (a) your doctor was at fault (the care provided fell below the "standard of care" applicable to similar doctors) and (2) that the doctor's treatment of you caused your injuries.
Most personal injury law firms, including us, work on contingency fee basis, meaning that there will be no charge for legal services unless there is a successful recovery obtained from the at-fault parties insurance company. So you don't pay anything out of pocket. Your legal fees and case costs are taken out of the settlement when the case gets resolved.
It would be in your best interest to retain a personal injury attorney as soon as possible.
No. Once upon a time it used to be a requirement. But it is no longer the case. You can file a medical malpractice suit without having an expert affidavit. But keep in mind that you WILL need an expert to testify at some point during the litigation.
Medical malpractice cases are very complex and you might be better off hiring an attorney to help you.
Judges and prosecutors are not so lenient on school zone speeding violations. You definitely need to hire a traffic attorney who can negotiate with the prosecutor to get the infraction reduced to non-moving violation or get it dismissed. I do not recommend mitigation (reducing the fine) because your infraction will go on your driving record and most likely you will end up paying higher insurance rate.
Your mother can petition for your sister based on family relationship. If your sister is under 21, she will be considered an "immediate relative." She will have special immigration priority and she will not have to wait in line for a visa number to become available. However, if she is over 21, then she is facing long waiting period (7 years). You should definitely contact an immigration attorney to explore all possible alternatives.
I agree with Mr. Shusterman that you should not have any problem at the port of entry. And although the decision to issue a student visa is highly discretionary, U.S. embassies are encouraged to re-issue visas to returning students. So you shouldn't have any problem renewing your student visa.
He should not have any problem since he has not been convicted of any crime. However, the decision of whether or not to issue a student visa is highly discretionary. So if the consular officer finds out about the domestic violence charge, this may affect his/her decision.
IF somehow a criminal charge is filed against you, your immigration status will depend on whether the charge is filed as a misdemeanor or felony. If it is a misdemeanor theft charge, then you will not be subject to deportation because a misdemeanor in Washington State is punishable only up to 364 days. But if it is filed as a felony theft, then you will be subject to deportation under INA § 101(a)(43)(G). Whether it is filed as a felony or misdemeanor will depend on the value of the stolen item.