I think you have no choice but to start cleansing yourself.
And then, start from there.
7 Years is too long and it looks like you have a lot of problems with digestion.
You must do research, research and research. Don't waste your time any more. They just wasted 7 years of your young life for nothing. Do the research and you will find the solution.
>>>At 16 I was diagnosed as depressed and I have been treated unsuccsefully as such ever since.<<<<
What was the treatment for depression?