Yeah, that never works for me. I have a goal weight and a date i would like to achieve it. I think that puts a lot of pressure on you. I just strive to continue working out in the morning and evening, eating healthy 90% of the time and just feel good about the progress I am making. It may not show on the scale but i can tell by the way my clothes fit. It's all good.
I get myself in trouble fast when I put a weight goal by a date. It has NEVER worked for me. I have to take it one day at a time and just work each day and try to stay away from goal setting on weight for me. Goal setting for me is to go to the gym X number of days - etc.
Learning to let go is hard, but it gets easier. I am not getting older just better!
If it’s only for two months I’d recommend keto with intermittent fasting and lots of water (enough for body weight, calculators online). 🍀
Get up off of that thing! - James Brown
"You don't stop running because you get old, you get old because you stop running." - Christopher McDougall, "Born to Run: A Hidden Tribe, Superathletes, and the Greatest Race the World Has Never Seen"
As you already seem to realize, that is just not a reasonable goal to want to lose so much in so short a time--not to mention, it's not healthy nor safe. I can only recommend that you set a realistic goal (say 2 pounds per week) and work toward that instead of setting yourself up for failure.
Wishing you all the best.
"I am only one, but I am one. I cannot do everything, but I can do something. And I will not let what I cannot do interfere with what I can do." Edward Everett Hale