Nighttime discomfort

My baby is 7 months old and has developed eczema over her face, neck and tummy over the last month. We have seen a paediatrician this week who has referred us to allergist as we think it has been triggered by something. We have an appointment in just over a week’s time. In the meantime, my daughter and I are getting no sleep. She is so itchy and waking every 20 mins - 1.5 hours (if we are lucky) to scratch and rub her eyes. I am co sleeping with her so that I can try and stop her from scratching in her sleep, but the only way I can seem to settle her once she’s woken is through nursing - so I am breastfeeding her 8+ times a night. They are short feeds, and lots of flutter sucking so I am sure it is mostly for comfort. She would normally suck her thumb but is wearing mittens for the scratching so can’t now. I do not want to let her cry it out, especially considering she is upset and in pain. I have tried E45, epimax, aquaphora and calamine lotion, steroid cream, antibiotic cream and antihistamines (all prescribed). She has a cool bath before bed and sleeps in mittens. We use air con to keep the room cool. Does anyone have any recommendations for anything else I can do to ease her discomfort and help us both sleep? 🙏🏼 Additionally, as I am breastfeeding, do I need to cut out foods that she might be allergic to as well. I understand with dairy, but does that stretch to legumes for example?