I didn't go through too badly until I was constantly triggered by being exposed long term to a similar situation. I have found for that this works for me. It is important you understand this is not a "real" plan - but a method. I get like that and I'm like la la la outloud while my brain literally screams at me the minute I am still. I have found that by setting a date in the future (three months away) seems to satisfy my brain and it will stop. On a logical level, I know that I am not going to actually do this. I'm not sure what if any feelings/emotions I have during this process, mostly I am seriously irritated because I know "I" do not in fact want to do this. For some reason, in my version of through the looking glass, this works. I would pick a date at least three months away, and subsequently, 95% of the time I will forget I did that until well after that date. If between the time I pick the date and the date, I am triggered again and thrown into this, I will look at what is surrounding this date - for example holidays, birthdays, commitments I have made with others and use those reasons to cancel or postpone if need be for another three months.
I have yet to have a "perfect storm" of that date and trigger coinciding so it has worked well for me. I also have an annual contractual agreement with my primary support person that I must call them prior to hurting myself in anyway. They are also aware of this coping method.
I guess it's a godsend that I have developed so many coping methods but at the same time, it can make actually healing and what not way more difficult.