Migraines can cause at least some of these symptoms. A lot of people get nausea, dizziness, higher blood pressure, and fever. Migraines are also linked with pain disorders in some people as well, so the back and stomach pain could be that.
How long have you had migraines? Do you take medication for them? Have you seen a regular doctor or a neurologist for them?
You should see your regular doctor first and get other things checked out to make sure that everything else is okay. Write down all your symptoms, when they came on, and the severity. This will help your doctor test for other things that may be wrong.
If it turns out that this is all from a migraine, I think that with this severity, you probably should see a neurologist who specializes in headaches. You shouldn't have to suffer like this. There are proven therapies and medications out there. You may have to try a lot of them to find what works for you, but the vast majority of people can find something that alleviates the pain.
In the mean time, cold compresses, over-the-counter pain relievers, and a dark and quiet room. Personally, a hot bath in a dark room works wonders for me. Sometimes just relaxing can calm things down. That should help the back pain, too.