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You should file a claim with workers compensation and also speak to the employer about what happened and demand to know what they are going to do about it so that this doesn't happen to you or to anyone else again.
If they are talking about disciplining you or dismissing you then you should know that the law is that you have a right to have your side of the story heard and for their to be a full and impartial investigation and for the decision making process in terms of what should happen to you be conducted by unbiased decision makers.
If you are dismissed and they say it is for cause you will have a case of wrongful dismissal.
They have the right to make sure you are OK because they don't want you endangering yourself or others. And they don't want you to say you are fine but later say you are not.
If the doctor said you are fine then they had no right to send you home and should pay you for the rest of the day.