Struggling

My 13 month old wakes up screaming (like blood curdling scream) every 5-45 minutes. Always has done. Cutting out dairy and eggs has helped but not totally fixed it, just means she's generally a bit easier to settle. I've been back and forth to the GP, hospital, paediatrician, no one is helping other than to suggest a food diary. I can't bear it. I feel awful that she's obviously struggling so much. We cosleep which helps with the exhaustion but I'm going back to work 4 days a week (with a 2h commute either way) soon to a new job and I just don't think I can cope. I will never sleep train or leave her crying but I'm just feeling so so helpless and overwhelmed.