Paula, you may need to try a different oil. Not everyone can tolerate flax. And even if you can, you'll need to build up the enzymes in your system. Many of us use enzymes to help digest the oil. You can buy them at any health food store, Whole Foods, Trader Joe's or even places like Walmart. I'd say try the enzymes first. If you still have issues, switch oils.
One of the truisms of SLD is that it works differently for everyone. Most of us have experimented quite a bit to find what works. And honestly, 2 days is nothing.
As far as the amount of fat, it's a sad and clinging myth that fat consumption is bad or, well...fattening! In fact, eating the right fats can help you loose weight. In many, many ways. Flax is definitely a good fat. And so are many others. Continue milling around the forum. You'll see a variety of fats that people use. Personally, I use a combination of virgin coconut oil and dairy cream.
Hang in there. Once you fin what works for you, this technique can be beyond liberating.