I've been employed for 8 years my question is is it legal for your employer to give you a job away after you come back from surgery

You should contact an employment attorney. What you have descibed may be a violation of the FMLA or ADA. However, these types of cases are very fact intensive so it depends upon what occurred and when it occurred. Feel free to contact my office to receive a free consultation.    Ohio FMLA attorney www.mcoffmanlegal.com