Hi - first of all thanks for the nice words Calgal!!
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In my case, the urgency of going to the toilet for a #2 will lessened as time passed. Probably in the first 4-6 weeks you will be in a situation of "when you have to go - then you have to go..." However, during this period I doubt you will have returned to work since it does take time to recover fully from this major operation. After 4-6 weeks then you can probably "hold back" for maybe 5-10 minutes without "an accident".
However, you can probably do something to manage this - perhaps every time you visit the toilet to do a #1 (~8 times per day???) then try to do a #2 (or a partial #2) at the same time.
I lost weight before and after the operation but this was probably as a result of IV fluids and minimal calorific feeding as well as reduced appetite for several weeks after the operation. However, my operation coincided with the time of my retirement and, much to my shame, I have put on some weight. This is probably caused by no work-related stress, getting a bit lazy in retirement and succumbing to too many chocolate biscuits during the day!!
However, if you are overweight then this operation and its associated aftermath does give you a "crutch" with which to lose weight.
If your weight is normal then you do need to keep contact with your doctors/surgeon if you find that after the operation, your appetite becomes suppressed such that you are losing weight.
Hope this helps - do come back if you have any further questions.