The police are allowed to use reasonable force to subdue someone. They are supposed to use no more than is necessary to get the job done. I can't tell from the facts involved whether the force the police had to use under the circumstances was reasonable or not, because this resulted in an involuntary commitment, and your mental state and its manifestations are important in that determination. I have no access to police reports and medical records.
It certainly looks as if the police were overzealous in the matter of your arrest. I suspect though that it is the fact of the 5150 and 5250 holds that affected the decisions of the lawyers back in 2010 and 2011.
Now, unfortunately, it is too late to sue for brutality, and that is why the attorney you recently emailed did not get back to you. The statute of limitations
ran out on a civil suit two years after the incident.
I wish I had better news for you, but you will be unable to sue at this time. THe most that you can do, and which may give you some closure, would be to report the officers involved to Internal Affairs and to your STate Attorney General
to provoke an investigation into their conduct. If your brutality claims bear out, while you cannot collect for them, the officers involved could face sanctions, including temporary suspension or termination from the force.