Sorry you are having a tough day.
Not quite the same, I started on 100mg clomid and on my CD10 scan I also had shown no response, however when they rescaned me the following week I had grown a follicle and I did end up ovulating from that cycle, just later on. So will be interesting to see if you have responded by your next scan. I did 7 clomid cycles and ovulated between CD17 and CD24.
I have a friend who has had failed to ovulate on clomid doses 50, 100, 150 and 200 and she is just about to start letrozole and is hoping for more success with that, so don't despair there are other options out there.