I do not wish to use my FMLA time but my employer is forcing me to

I work for Albetsons Inc. I am on disability for stress unrelated to work. I turned in a doctors note to notify my company as such. I am collecting State disability. My employer had me fill out a form to request either a General Leave of Absence (GLOA) or Family and Medical Leave (FMLA). These to options were on one form. I put a line thru the FMLA portion and wrote N/A. I then filled out the GLOA portion and next to my signiture wrote "not applying for FMLA". I have since then received a letter from Albertsons granting my application for FMLA with a copy of a like form that I filled out (not the exact one I filled out) and in the employee signature part they have written Employer Designated. I called my Union and they told me that none of the other company's IE: Ralphs, Vons, Stater Bros. require this of their employees and they, the union, feel that it is not right, but that they cannot do anything about it. SO, here is my question, What if I DO NOT wish to use up my FMLA time and my employer is forcing me to? I after all did not apply for it. Thank You Cynthia Hussey