There are a number of federal court cases that say an employer is required to separate you and the alleged offender, at least until the complaint is fully investigated. If the charges are found to be true, the employer is required to ensure it doesn't continue, which usually means firing the harasser or having the two employees work in different places or different shifts. If you have to quit because the employer failed to eliminate the harassment, you were "constructively discharged" and have the same rights as if you were terminated for complaining about the harassment. See an attorney soon, the statute of limitations and time to file a claim with the appropriate government agency is usually very short (90 to 180 days).