After 2 pregnancies, I now believe that 41 weeks is my normal. That's just how long my body takes to "cook" a babe. So if you take until your due date or longer, I would try not to worry. I think you are right, the complications of induction don't sound pleasant for mom or babe.
Sorry about the headaches - I suggest you drink more water, juices, pay attention to your nutrition lots of good nutritious foods. And spend some time napping, meditating and relaxing.
DH and I had sex to get things going - it really does work. I don't suggest you walk a whole bunch or anything since you don't want to tire yourself out b4 labor.
I actually had slightly elevated BP while just hours b4 giving birth to my 2d and my midwife really kept on top of it and it didn't escalate. She gave me Tranquil Mama an herbal remedy to chill me out and it did work. Also having a doula and my terrific DH did a lot to chill me out and bring the BP down. I know it's hard but try to relax.
As for the cohosh - I would pick up a copy of Susun Weed's Herbal for the Childbearing Year. She has a wealth of knowledge to share with you. I LOVE this book and found it very helpful. Blue cohosh should bring blood pressure down - Weed describes blue cohosh and pennyroyal to bring on precipitous labor. Blue cohosh is not recommended for women with low blood pressure. I think the book is worth a read for all the other wonderful stuff in it.