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Police have limited immunity from suit or prosecution when acting in the line of duty. But this has all the hallmarks of a police brutality matter. What you need is a civil rights lawyer and you want to find him sooner rather than later while the extent of your injuries are still obvious.
We are not able to represent with your matters because JustAnswer is not a law firm and our bar associations would not allow it. It is also against the site's terms and services for us to refer you directly to a particular lawyer or law firms. I can, however, direct you to the same sources that lawyers themselves use when they need to consult with a lawyer in another state or sub specialty and don't know of one.
If you don't know where to find such an attorney you can try the Texas Bar Association's Lawyer Referral Service. They charge a fee of around $50 for the referral, which includes a free half hour consultation with the attorney. For a broader range of options you can also look at Martindale.com, a commercial lawyer referral service with an excellent reputation. Many of Martindale's lawyers are peer and client rated, which can be useful to help refine your choices.
Finally, sometimes it's difficult to find local lawyers who are willing to go head to head with police. So it's not a bad idea to contact the American Civil Liberties Union. The ACLU specializes in civil rights issues and they have branches all over the country. They should be able to steer you to someone in your area that is not afraid to try a brutality case.
I'm not sure what your specific question is, as you didn't ask it. But your first step, along with getting your necessary medical treatment and documenting that and your injuries, would be to find a lawyer so that you can proceed. There are frequently notice requirements when you wish to sue the state, county or one of its agencies, and you don't want to miss any timelines.