Early labor, 4 days?

I was told Sunday night that I was in early labor and should be having my daughter very soon.
After going to the doctor today I'm exactly the same as I was on Sunday and my midwife seems completely unconcerned. However, I am staying on bedrest due to high blood pressure.
I'm 3 cm, 75% and I have contractions about 2 hours at a time, a couple of times a day.
I've been home from the doc's for 3 hours now, and I've been having contractions this entire time. They're the strongest they've been so far, about 12 minutes apart, lasting about 30 seconds. On a scale of 1-10 I'd rate them at about a 6.
When do I know it's time to call my doctor's office/the hospital?
My midwife doesn't seem to want to share much info with me and every time I call the office asking someone's opinion I get pretty much blown off, and they tell me I'm fine.

I'm just so uncomfortable I really don't know how much longer I can go through this. It literally brings me to tears having to deal with this, I feel like I'm losing my mind.

Without panicking, ring your doctor and explain the situation to ease your mind. Are you noting on pen and paper each time you have a contraction and how long they are lasting for. This will help you and your midwife assess the situation. Your contractions are only 12 mins apart as from 2 hourly so you need to make that call now. Do you have someone that can take you to the hospital? Some times you have to really put your foot down when you are worried about something so important.

when those regular contractions are 5 mins apart for 1 hour or your waters break than it is time to go to the hospital.

if you can keep in the sitting position it helped me dilate better and i knew it was time for the hospital when i felt i needed to push, good luck hope it goes well x
try to calm down and take deep breathes when you get another, it is painful but you will get through it and you'll have a gorgeous baby to show for it

I would probably go to the hospital. You could at least get something for the pain if they don't keep you there. If that isn't an option would you be able to take a bath? Relaxing in the warm water may take a little of the pain away and also allow you body to relax. Sometimes if we are experiencing a lot of pain, or anxiety it will only make the labor longer, because our body is fighting against it. I know it is hard, but do what ever you can to help you relax. Try taking some Tylenol for the pain if you stay home.