if you get arrested for felony but released without seeing a judge or posting a bond. Are the charges dropped?

The only way to find out is for someone to contact the police or prosecutor's office to determine if a case is pending against you or not. Some Jurisdictions have online court explorers, you can enter your name and see if there are any pending cases. Have counsel find out for you, it is best. If there is a case, eventually the charging jurisdiction will issue a warrant for your arrest and warrants never expire; you need to know what is going on. I reccomend you find a criminal lawyer to help you with this.