Preparing Food - Fibromyalgia

My fibromyalgia has got significantly worse since my initial PIP claim a few years ago. I'm not sure which descriptor to choose for preparing food. I used to be able to prepare food with aids. Now I can only do that twice a week at best. If I do, I often need to rest regularly during preparation and don't have the energy to eat until hours after. It's more common for me to have three or four days where I cannot prepare food due to pain and fatigue. I either have to rely on ready made meals, ordering in, or sometimes I'll go a whole day without eating as I don't have the energy or will to eat. I've recently received my PIP review form. I've been granted an extension to complete it due to frequent flare ups, but I'm finding the whole process really stressful and I'm confused about the descriptors.