Girl... I can help you! With the weight and the back injury. Come on now! First of all... where did you go to figure out your calories?
Basics. A calorie is a unit of energy. 1g of protein has 4 calories, 1g of carbohydrate has 4 calories, 1g of fat has 9 calories. All of the functions of your body require energy (calories). Your body, if you stayed in bed all day long and didn’t move a muscle, requires certain number of calories to keep going. That’s your basal metabolic rate or BMR. The number of calories you burn in any given day doing whatever you do that day is your total daily energy expenditure. Whatever calculator you used is basically just guessing what that number is based on your height, weight, age, gender, and activity level. It’s just a guess. Just a starting point to help you decide how many calories to feed yourself every day so that you’ll be eating less energy than your body will require. When you eat more calories/energy than you need, your body stores that energy as either muscle or fat for the times when you don’t have enough calories to eat. When you consume less calories/energy than you need, your body turns to that stored energy to burn so it can do everything it needs to do. Basically, your fat and muscle are a backup gas tank to use in case you don’t get to fill the main tank (your stomach) with new energy (calories). To lose weight (ideally fat) you just have to consume less energy than you need so that your body uses all the energy it’s stored. Now... the trouble with long time, very low calorie (what you’ve been doing) dieting is... 1500 calories means you’re likely not eating enough protein to sufficiently preserve your muscle. Your body will use that just as readily as fat. So you stay at 1500 calories and you lose some weight... but some of that muscle. Muscle is more dense (it takes up a lot less space) than fat so the more of it you have, the more calories your body requires while being overall smaller. Also, if you stay in a caloric deficit for a very long time, your metabolism will eventually slow. I know your history... honestly, I’d bet you anything that focusing on building back muscle for a few months would be the best thing for you. You need to focus more on body composition than weight. More muscle, raise your metabolism, stop starving your body so it can recover from workouts... THEN cut calories. Short cycles... a few months of cutting and then either a muscle building cycle or eating your maintenance level of calories (only as much as your body needs to function). I’ll talk for days about this stuff. I’m here to help if you want it!
oh... and while 1900 sounds like a lot because you’re used to 1500... let this give you some perspective... my TDEE (maintenance calories) is about 3,000. So yeah