I posted this in another forum yet feel it is relevant to your situation so I hope this isn't against the rules.
I would suggest going to a good hypnotherapist. Hypnotherapy is the only form of therapy that works with the subconscious mind to directly change how it has perceived past experiences, as well as how those past experiences effect you in the present.
Psychiatrists and psychologists are only capable of working with the conscious mind(unless they are hypnotherapists as well), which is useless because everything that makes the conscious mind what it is(thoughts, beliefs, actions, habits, etc...) stem from the associations held within the subconscious mind.
If you've ever smelled a familiar food, or visited somewhere where there was emotional significance(or in this case things you used to do with your parents), you'll find that often you will spontaneously re-experience the emotions attached to said food or place. This is but one example of how many associations are in the subconscious that we aren't even aware of until they are brought up by what is known as a trigger.
There are many things a hypnotherapist can do to help you move on. For example death bed therapy, where in a hypnotic state you very vividly get to talk with your parents right before he/she died, and say all the things you ever wanted to say, and hear what they think about it too. You also will experience all the love they have for you, and get to shower them with the love you have for them. Very healing stuff, especially in a hypnotic state.
Also, hypnotic self-forgiveness therapy is very effective in helping those dealing with a loss to move on, and begin living with no regrets related to the past. There are many other forms of hypnotherapy that are effective as well. Go find a hypnotherapist who is familiar with chair/deathbed therapy. It will change your life and help you move on. If you live in San Diego, I can help. It usually can be accomplished in just 3-5 sessions! And it is much less expensive than what a psych. doc would charge you(not to mention much more effective). For example, I only charge $400 for 6 sessions, and they can sometimes last 3 1/2 hours! I wish you all the best on your path to healing, and hope that you will take what I said to heart, as it is an issue I work with all the time.