body physically will not stop losing weight?

this is basically a last resort because doctors are not helping and im hoping somebody with weight loss knowledge can help.

last year i started losing weight at 5’7/145lbs on a low calorie diet, i wanted to be 125 (BMI 22 to 19.5) i lost the weight, calculated my calories for maintenance and hit maintenance every day. i weighed my food to make sure i was eating enough and bought a fitbit that measures tdee, and researched multiple websites to calculate it. the consensus is that ‘active’ starts at 15k steps and thats the only exercise i get, so i ate that. i transitioned to maintenance in april and since then i have lost another 20lbs. i am now quite underweight and literally cannot understand why this is happening

i have had bloodwork done, i dont have celiacs or anaemia and my thyroid is fine. i know it sounds like i just need to eat more but i am consistently eating 2500 calories a day when im burning 2000 MAXIMUM and im still losing weight. if it sounds like im underestimating my calorie needs, i would have to be a literal professional athlete to need 2300 calories a day and i walk slowly to and from school, then sit on my ass in front of the tv for the night. i have to eat 3000 calories for the scale to move even slightly upwards, and any deviation from that will make me lose weight. (tmi warning) often i will gain food weight on 3000 calories from the sheer amount of food i eat, l will go to the toilet and find that i have lost weight again.

for context, im turning 18 and my diet was quite low calorie, and i think i unknowingly ate very little fat for the whole period. i have symptoms of ibs now but no gut or bladder infection. i also dont get my period because im so underweight now.

im posting this here because doctors tell me to eat more and arent interested in my telling them of how my calorie intake is extremely high. family and friends literally dont believe what i tell them and im just so perplexed. i have a food scale and eat every last bite of everything i count

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