Tried to install boot camp and now can’t get into my Mac OS hard drive
The partition information for macOS appears to be stored in the MBR partition table. You will need to manually copy the values from this table to a newly created GUID Partition Table (GPT). 


Boot to Internet Recovery mode.
Open a Terminal application window.
Use command below to printout the values in the MBR table.

fdisk /dev/disk0

Use the gpt command to create a GPT with the partition entries.


I would give more detailed instructions, but I would first need to see the output from fdisk.