M.R.
I'm not trying to be harsh or mean when I say this but if you're going to continue down the fertility road, you need to be extremely patient and have an open-mind. You may go through one more round of Clomid or you may go through several more years before conceiving. As someone who has ridden that roller coaster, I know it is hard not to be disappointed but the reality is that you may have a lot of failures before you have success.
Maybe nothing went wrong. Since your body isn't doing what it needs to do naturally, your doctor is trying to regulate your hormones through medicines. This isn't an exact science and it could take some trial and error before the right combination is found.
Be patient and positive. We went through three years and a miscarriage before we conceived our first and have gone on to have another child as well. Understand there may be setbacks along the way but try not to get too wrapped up in them. Mourn a cycle that didn't work and then move on with high hopes and positive feelings on your next try.
Best wishes to you!