Lost partitions and issues accessing recovery mode

Hi,

This is an old problem that I had on a Mid 2012 Macbook Pro a few years ago, since then, I haven't really used it at all, but I would like to try and rectify the problem.

A few years ago I had a big issue when trying to log in to my macbook, something corrupted. At the time I had a dual partition with windows 10 (about 150GB) and Mac El Capitan (balance GB) on a 500GB SSD. I couldn't access anything, so I did a recovery.

The disk was split in to occupied space and free space, which was about 170GB available, so I effectively made a partition of new Mac, and the partition of the old mac and bootcamp. Hoping that by doing this, I could some how get to the point of fixing the partitions of the original bootcamp/macbook drives.

On boot, it takes about 60 seconds, the circle with a cross appears and every 10 seconds, the apple logo flashes for a brief second before the circle cross again. After the minute, it boots as normal to the new partition.

I cannot access cmd+r for recovery, I just get a white window and have to crash out

I cannot therefore use a tool like Recover.IT as I cannot disable "csrutil disable" in cmd+r

I cannot update the OS, probably to do with the cross that appears on the boot and the time it takes to finally start OS.

That was as far as I have got, I cannot use any recovery utilities.

Can anyone help reinstate the partitions? if not, how can I format the complete drive and reunify to use the 500GB drive total? can I use a USB stick and run a MAC OS reboot within the OS? I have a windows PC, I could plug the SSD in to that and format it using windows.

Thanks

The about/storage shows only the new partition

The terminal shows the total disk space, with no partition assigned.