Why is an NHS trust stopping me from receiving potentially life-changing treatment?

Having always had a difficult relationship with food, weight and exercise, a decline in my health during the pandemic led to me becoming anorexic and losing a lot of weight. At that time I still weighed over 9 stone, but I would check my weight three or four times a day and see myself limit the amount I would drink in case it made me heavier. Things have since become worse, and I now weigh under 6 1/2 stone, with a BMI of around 13. I truly want to get better, but for so many reasons putting weight on is difficult. Firstly, it's the mental battle. A slight increase in my weight terrifies me - it makes me scared that I'm out of control and will become fat again, rekindling feelings I had as a teen. I sometimes take out half a spoon of rice from my meal to calm myself down. But my needs are even more complex because I have severe IBS and Functional Neurological Disorder which makes it really painful to eat as my nerves are ultra sensitive. I find eating solid ...