I think it's likely more than that, especially when those thoughts can be blocked by food, Netflix binges, reading etc. I recall John (Obese to Beast), saying when he was at his largest, which I believe was low 400s, that he feared being alone. Not only was he constantly in pain, he actually feared dying when he was alone and no-one knowing. Amber must fear death constantly, if not death then sudden falls/stroke/heart attacks etc that can cause even more painful injuries that completely immobilise her. If she's alone when that happens, and she can't reach or use her phone, then who will know....nobody.