What are the main signs and symptoms of migraines?

Condition analysis:
Wow. I'm sorry you're having so much trouble. Although we can't diagnose, I certainly can suggest some things to discuss with your doctor. Several possibilities come to mind as a read your question:

1) Were you given a diagnosis more specific than Migraine? A particular type of Migraine? If not, your diagnosis is incomplete. It can be important to know what kind of Migraine we have for several reasons, including the fact that some Migraine medications aren't recommended with particular forms of Migraine. 

2) Your description of having a dull ache some days, but more severe headaches accompanied by vomiting could fit chronic Migraine, which is tension-type headache or Migraine 15 or more days a month, at least eight of which are Migraine. 

3) It's not unusual to have more than one type of headache, more than one headache disorder.

4) Short stabbing pains might be ice pick headaches. It's not uncommon for those of us with Migraine to also have ice pick headaches.

5) How many days a week are you taking medications to relieve these headaches or Migraines? Taking Migraine abortive meds such as the triptans or ergotamines or any kind of pain medication -- prescription or over-the-counter -- more than two or three days a week can make matters worse by causing medication overuse headache (MOH), aka rebound.

Instructions:
Ice Packs: Always opt for cold rather than heat to stop migraine pain. "Ice is an anti-inflammatory," says Carolyn Bernstein, MD, clinical director of Harvard Medical Faculty Physicians Comprehensive Headache Center at Beth Israel Deaconess Medical Center.

Supplements: In a recent study, patients who took 400 mg of riboflavin (vitamin B2) daily experienced significantly fewer migraines after 3 months. CoQ10, another supplement, also proved effective in preventing migraines in a clinical study.