Well that is the worst case scenario and I think anyone would be devastated.
I don’t think it ever happens with experienced first world doctors though.
I’d say a more realistic ‘bad scenario’ is some pain, tiredness and general limited mobility on a permanent basis. My impression is that LL is a fine balance between increased height and limited mobility. I don’t think you can ever return to pre-LL mobility but if things go well the loss of mobility might be 10-15%. I guess for me personally, not being able to walk stairs, go for a run or do sports without feeling annoying pain, getting tired very fast would be a failure. I would probably feel quite sad about it but try to enjoy the gained height. I think, for anyone who has liven with legitimate height nerosis, being able to socialize with people while being happy with your height and not worrying about is a big enjoyment. So I would still try to enjoy those situations as much as possible.