booted from er job while on general medical leave

hello all
2 questions--
1--has this ever happened to you
2-what would you do
the background----
had meniscus surgery in august-forced to work hurricane gustav while on fmla{family medical leave of absence}--had second meniscus tear while working-doctor refused to call it worker's comp injury-md works for hospital--had second surgery in oct--ran out of pto/sick time and fmla time-was put on general medical leave till i could return-received letter stating i was "termed'-in mid december-stating exhaustion of loa{leave of absence]-called head of human resources who did not know of this and did not know reason that i was let go--they call it releasing from the system--not fired-not terminated etc.--noone could give me an explanation---with hca you have 3 months fmla leave and 3 months gml before they talk of letting you go--
so here i am-still not cleared to work/unemployed
and i am stumped--i loved my job-had no complaints about myself or my work

so what do ya'll think--

thanks--beaujacques