Im so sad that happened to you, 
M morganii strains are naturally resistant to penicillin, ampicillin, ampicillin/sulbactam, oxacillin, first-generation and second-generation cephalosporins, 
erythromycin, tigecycline, colistin, and 
polymyxin B.
Most strains are naturally susceptible to 
piperacillin, ticarcillin, mezlocillin, third-generation and fourth-generation cephalosporins, carbapenems, aztreonam, 
fluoroquinolones, aminoglycosides, and chloramphenicol.
The widespread use of third-generation cephalosporins has been associated with the emergence of highly resistant M morganii