Dear Debbie
i'm sorry the road continues to be rough for you.
Short- and long-term disability are basically just different time periods. probably every insurance defines them differently, but the way it worked where i worked was that the short term kicked in if the foreseen absence was up to X weeks, and long-term was if it was greater than that.
if you are already receiving performance warnings at your job, i would do the disability - long or short, whatever your doctor suggests. the time needs to fit the time it will take you at least to finish the ECT treatments and recoup from them.
when you are doing better you will either be able to go back, or if not, you can figure that out then - ask for accomodations, get a different job, whatever.
but doing disability is still better than quitting or getting fired because you will continue to have income, and health insurance benefits, and technically you will not have a hole on your resume if you do end up needing to go elsewhere.
trust me. i've done disability and i've also quit cold before. no income and holes on the resume are HARD.
~ waves ~