I’m not sure if I missed the information, but I don’t see how much of a weight difference in when you were measured, and what you weigh now. Depending on your height and the weight loss needed, seven months is a LONG time to get there.
When losing weight, diet is more important than exercise, which is good news if you’re facing exhaustion from medication.
I’m a big believer in CICO (calories in, calories out). You would calculate your average calories used daily (TDEE), and then subtract a deficit to get to a calorie goal for the day. A 500 calorie deficit every day would equate to one pound lost a week. If you’ve got a higher TDEE either from being a larger person, or from exercising, you can safely have a 1000 calorie deficit, and thus lose approximately 2 pounds per week. You can eat whatever you want, and not exercise, just as long as you’re using portion control and making sure to keep under your calorie goals.
For personal experience, I’m 5’3, and started at 167 pounds. I’m extremely sedentary, so my TDEE is approximately 1700. I shoot to hit 1200 calories a day. I’ve lost 22 pounds without exercising. I’m trying to increase my activity level, as being a couch potato is not good for my overall health, but I know that ultimately, it’s not going to have much impact on my weight loss, just my overall wellness and muscle definition.
I use the MyFitnessPal app to track my calories, and the reddit group r/loseit for inspiration and support. r/1200isplenty is good for food inspiration, though they get a bit diet food crazy sometimes. I love food, and by calorie counting, I can still have all sorts of delicious foods, I just need to make sure to have them in moderation.
Also, here is a great website that can project your weight loss schedule:
Important to note is that water weight can cause you to appear to not lose anyhing. Your goal should be to lose fat, so look at the long term picture, not the week by week fluctiations. You also should be hesitant to eat under 1200 calories a day, as many doctors do not recommend. Often that is the bare minimum that your body needs to function well, but everything is individual. Also, recalculate your TDEE every one and a while (ten pounds or so) as it will decrease if you remain sedentary and lose weight. (Less energy to maintain less mass).
I’d also highly suggest speaking with a tailor to discuss options for letting the dress out or other methods of expanding your dress. It sounds like you’re under a lot of stress, and putting that much pressure on your body can be really challenging. It would be better to have a backup plan, and be pleasanly surprised, than upset if you’re not losing as quickly as you want.
CICO can be used with other weight loss methods such as weight watchers, Whole30, and Keto.