Kara,
The call of the ocean and it's sister waters are very hard to ignore once you experienced what they have to offer. Although it has been sometime since your past unfortunate expereince, it sounds as if you have a few more steps to take to continue with the emotional healing form such a traumatic event. As it appears that you were in engaged in activity in which your mother loved, there could be no more honor to her, to continue with her dream. As it appears you were engaged in an activity in which you greatly loved, there could be no more done, to honor yourself and continue with the exploration of part of this earth that not many choose to see. As you see, there will be many to support you and I hope you truly take up those offers of assistance. As you are concerned with flashbacks, yes they will occur, but remember, there are not a bad thing, but a way our mind heals form a traumatic situatin. With each flashback, we work on how to control our anxiety and eventually the flashbacks turn into just a bad memory, and then just to a memory. It very similar to how we all start diving, we are all nervous and concerned and eventually learn to deal with each problematic thought in our head. This comes through support of experienced others and practive, practice, practice. The situation you are in is very similar to being in a car accident and losing a loved one. After the car accident you need to decide if you will ever drive again, or how soon you will drive again. Everyone will give you varying opinions about when to return to driving, but the only one to answer that question is you.
As far as persons commenting on your past experience on this board, although we try to reamain constructive, sometimes it is easier for us to point out others mistakes or speculate on our own safety so we can individually feel safer. People need to point out mistakes they could "never" make due to their experience level or personal skills. It's a method of healing by blaming the victim. Happens all the time. Although some accidents are preventable, not all area avoidable, hence the word "accident". Somethings are not in our control despite what we tell ourselves.
I apologize for such a long response, but when I read your thread it struck a hearstring. About four years ago, I lost my best friend in a diving accident in the keys. It was a simple event, happened quickly, much specualtion occured from nonfactual information, which made some of the pain worse, and I needed to answer to same question you asked. I returned to diving shortly after the accident, to sort out my own anxiety about diving, and it was tough at first. However, with support of good fellow diving professionals and friends , I went on to become a rescue/public saftey diver even though I was an experienced diver prior. I guess it was a way to honor my friend, who was the one who got me into diving in the first place.
In closing, my condolences on your loss as I know first hand the emotional toll it takes. My commendations to you, in returning to an activity that both you and your mother enjoyed.
Sohnje