Is it possible to lose 20-25 pounds in 50 days

So long story short my weight fluctuates bad. I mean I can fluctuate 6lb in one day gain or lose with that being said I can never seem to keep it off effectively. I was 2:60 and rn I’m 240 but I was 222 not even 4 months ago and wanna get back their before a trip I’m taking in January so is their a relistic way to get their I have started doing exercises again am starting out at 25 sit up’s 15 squats and on a hack squat machine 10 minutes on each leg and 20 on both but is this relistic I have found I can do a calorie deficit of 1500-2000 but the biggest thing is my weight flux I have seen doctors but it’s really just inflammation and me getting sick.