Sorry to hear of the situation. The recovery of repressed memories is a highly controversial topic in Psychology. The American Psychological Association formed a working group (a group of people assigned to conduct a very specific task) to review existing research evidence relating to memories of childhood abuse and made several conclusions that are relevant here:It is possible for memories of abuse that have been forgotten for a long time to be rememberedIt is also possible to construct convincing pseudo-memories for events that never occurredThere are gaps in our knowledge about the processes that lead to accurate and inaccurate recollections of childhood abuse
So, what we can take from this is that there is convincing evidence that memories can be repressed and then recovered after a long period of time BUT fake memories can form that seem real AND we don't really understand how to tell the difference between a real and fake memory.
My suggestion would be that if you do decide to try and recover lost memories (which is your right to do) keep in mind that there is serious doubt about whether you would be able to tell if the memories were real or not. The term False Memory Syndrome has been coined to describe situations in which a person's identity and relationships are affected by memories that aren't real. This is also a controversial concept.
There is no specific technique or therapy for recovering lost memories but the term Recovered Memory Therapy (RMT) refers to several controversial and/or unproven interviewing techniques, such as hypnosis and the use of sedative-hypnotics. Proponents of recovered memory claim that traumatic memories can be buried in the subconscious and affect current behavior, and that therapy can recover them in order to heal the individual.
As there is no specific technique or practice you could teach yourself your best strategy will be to begin to learn as much as you can about RMT and make a decision about whether it is potentially an area you could adapt for your own purposes. You can start by reading this summary here http://www.caic.org.au/fms-sra/rmt.htm
This is a very controversial area so my advise would be that you educate yourself fully on both sides of the argument before making any decisions. This is probably no the kind of answer you were hoping for but unfortunately there is no specific technique I can direct you towards. I have deliberately refrained from giving my own personal opinion on this matter and have tried to provide you with an unbiased summary of the current state of knowledge in this area. If you would like me to provide you with my own personal opinion I would be happy to do so.
I will stop here and wait for you to look at what I have written and get back to me with any questions you may have at this time.