Partition Content not showing

Hello, I am using

MacBook Pro (Retina, 13-inch, Late 2012)

Processor 2.5 GHz Intel Core i5

Memory 8 GB 1600 MHz DDR3

Disk Partitions
HD 45 GB

HD1 75 GB

Everything started going wrong after I upgraded to Yosemite. My computer started crashing and I had to re-install Yosemite. After one of the crashes I went to Disk Utility and tried to merge my partitions by clicking the - sign at the bottom of my HD1. Now HD1 is not showing at the left panel of my Disk Utility. It also disappeared from my Finder's window.

In terminal I get the following

diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage 45.4 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD *45.0 GB disk1

Logical Volume on disk0s2

E66D8741-C897-42A2-B761-E5EFF0DAE6C2

Unlocked Encrypted

How can I retrieve my content?