My main problem is the my client crashes about two minutes after starting to update, so I cannot access the debug window to extract my PKs. This is error log from my last session. Any help would be appreciated.
2018-01-16 14:45:38 ERROR: ReadBlockFromDisk: Errors in block header at CBlockDiskPos(nFile=1122, nPos=90868107)
2018-01-16 14:45:38 *** Failed to read block
Seems like you either have corrupted block file(s) or possibly a hardware issue where Bitcoin Core cannot read a particular block file from the disk correctly.
Firstly, I'd recommend that you find your Bitcoin Core "Blocks" folder.... delete all the blk0xxxx.dat and rev0xxxx.dat files that are numbered 1122 or higher... then restart your Bitcoin Core and let it sync up. See if that works.
If it doesn't, try a basic disk scan and see if it detects any bad sectors etc.