Jarl - I'm not disputing your numbers because although I disagree with you often, you do not come on here and lie to us. Your wife's premium tripled - and that is way outside the norm. There were two Brookings studies which conflicted. One (Adler and Ginsburg 2016) said that average premiums dropped after ACA, and another (Kowalski 2014) said that average premiums had gone up by 24% over what might be expected from run-of-the-mill inflation.
There could be a mathematical explanation for why an individual's premium might rise by a higher amount and I will use some made up numbers to illustrate my point. Suppose the actual premium used to be $1000 per month and it went up by 20% to $1200. Suppose your company paid $900 per month of the premium and you had to find the $100. And when the premium went up the company said - we're not paying that, we'll stick with the $900. Which leaves the insured having to find $300 a month, an apparent tripling of the premium.
I don't know why your wife lost her doctor. I know that as a result of routine every year changes in my company's healthcare option I had to change doctors I think maybe twice over the last 35 years or so - networks change, HMOs (remember them?) have different policies, and so on. And I certainly saw no changes in my and my wife's doctors (five or six in all) as a result of ACA. YMMV.