Food, weight, diet, trouble with meds - any one of these issues can be tough for a lot of people to face. I think you are handling this with a lot of solid insight and courage
@Sideways.
Weight gain from meds is really tough. There is one med that does me in, even when it doesn’t affect most at that level I took it. Works well for me when most meds cause bad allergic reactions, but not being able to eat enough to fuel my body through my day got really hard really fast.
I know the GP is too much, what about visiting with a dietitian again? They are unlikely to hospitalize quickly and may have some great advice about how to not run into nutritional imbalances. There was a time I was so anxious I stopped eating much. I wasn’t trying to lose weight... but by accident I became anorexic. Dietitian helped me figure out low to no prep meals and shakes I could down.
Meal prep kits are actually kinda fun for me when I’m depressed I don’t want to eat or cook. That might be a great way to go to replace some of the shakes.
For muscle aches, amino acid or trace mineral supplements might be worth trying. That can get expensive, so I wouldn’t try it unless the blood levels fail to point to another clear problem.
As far as the lack of clarity as to if this is an eating disorder or not... One can be
anorexic and obese. ED can be caused by a lot of things, legit concerns about weight gain from meds being one of them. One can get anorexic because of meds too, or as side effects of treatment for medical and mental health conditions like chemo... They all have different solutions and steps to take to remedy. There isn’t a one size fits all ED. I think because of the family history, you have a lot of pushback around calling this an eating disorder. If the label will help you look at everything comprehensively and is a tool to get healthier, then use it. If it shuts you down from solutions because of comparing yourself to your sister, then don’t worry about the label. There’s no reason to be ashamed of the battle with good and weight. Hits a lot of us dealing with PTSD and mental health differently.
I hope the body aches get better soon.