The KJV Bible is non-denominational. It has nothing to do with SDA.
I'll let you in on something. I have a local SDA church, but I've only been to it 3-4 times. I don't sit around and endlessly pore through a list of SDA rules or Ellen White writings. I base everything I believe on the KJV Bible alone. It just so happens that I call myself "SDA", because what I belief falls in line with what SDA believes. I belief in Sabbath keeping and not eating unclean meat.
I don't consider keeping the Ten Commandments a burden. I don't consider turning away from things that cause me to sin a bad thing.
As for quoting Ellen White, you can find one post on Reddit where I posted what she said about sacrificial law. I didn't comment on it, I just posted it at the end, because she was mentioned by another poster and relevant to the discussion. I never quote Ellen White to prove a point, because the Bible does that just fine.
This idea that you think I've gone off the deep end, like your friend, is touching and well-placed, but I can assure you, trying to be a good person is a good thing. I have zero stress in my life, I'm at peace. I don't fret over anything. Most importantly, I enjoy life.
Let's go over exactly what I've given up in my "strict" life. I gave a way hundreds of DVD's to Goodwill, stopped my 30 year gaming habit, stopped (sexual self-gratification), removed stimulants like coffee from my diet (which by the way gave me heart palpitations anyway), removed most sugar and dairy (that's been about 10 years now, long before) and I dropped some friends on Facebook that I have nothing in common with. Oh and I dropped unclean meat. I obey the Sabbath. Scary strict stuff.
You're welcome to believe what you want to believe. I have a firm belief that if I'm going to be a Christian, I shouldn't be lukewarm as far as the Bible is concerned. It hasn't caused one bit of anguish in my life. I'm at peace and more stress free than any time in my life.
So no, I'm not this SDA fiend you make me out to be. I'm passionate about sharing God's word and witnessing to others. That doesn't make me a lunatic, although I appreciate the concern.