Im sorry youre feeling so out of control. It is frustrating not knowing what to do or what is the right thing to do. Can you get a second opinion or would you feel better trying a different doctor? Sometimes the physician makes all the difference. Even if they recomend the same things, how options are presented to you can make all the difference. I wish I would have switched OB doctors sooner than after my second miscarriage. I think my situation may have turned out differently had I had better communication, and more empathy.
I am at 22 weeks and on bed rest after a cerclage. Mine was 1.3cm, where my first child was 5cm at 24 weeks (looking at records). Needless to say, we were shocked. I was very active for my first pregnancy (kickboxing and martial arts) and this pregnancy has been so different. So much waiting and watching and being super careful. Its been a hard transition.
I hope you are doing better.