Excel Summary Creation based on checkbox list

Hi,

I am trying to create a summary page where the boxes checked (showing symptoms) populate into one cell but can't work out the formula to do this. Ideally, I would like it to work so that you can quickly identify the symptoms experienced on a single day. I am having trouble with the spillover as well. The symptom checklist and symptom summary are currently on two different pages. 

Can someone please help me with this.