My prayers are going out for you and your baby.

Please hang in there.  Although I never took Dex,  I remember that with both of my pregnancies my nausea seemed to go away over night.  It subsided a lot at 6 weeks and was completely gone at three months on each one of my pregnancies.

Each pregnancy is unique and special in their own way so it is not unusual to experience different things or nuances with each one.

I did have an amnio with both of my children without any problems except for a small amount of blood on the first one and minor cramping on the second one.