My Coaching Niche??

I have been reflecting for a year now as to what niche to choose. At first I just thought I could just be a 'life coach' but apparently the way to go is to specialise. Now I agree and you would'nt believe the different types of coaches that exist. I shall list a few : Divorce coach, debt free coach, wellness coach, spiritual coach, business coach, dating coach, weight loss coach to name a few.
I have had various ideas, parent coach, expat coach, energy coach, retirement coach but the one idea I keep coming back to and the one I feel the most passion about, is helping people who have got or had cancer or another serious illness. I would also like to help the partners, family, parents and friends of people dealing with a loved one who is ill. I have had experience from both sides after having cancer myself and losing my sister in law to cancer and that is where my passion and understanding comes from. I have been making excuses an awful lot that I am not well enought qualified etc. I hope to get over those obstacles I am putting upon myself, by doing my 2000 word research paper required to graduate with ICA on where a life coach can help patients best, at what stage and how could I be most useful. I intend to do a questionnaire to MacMillan nurses and the equivalent to get some feedback. I do also want to look into doing a councelling course it is such a serious subject I want to be as good as possible. Then there's the question of what I call myself. Cancer coach just does'nt sound right so any ideas would be appreciated.