My triggers are:
Orange food colouring
Bright or flashing lights, sometimes even the sunlight reflecting off something shiny
Extreme cold or heat
Lack of sleep
Not stress itself, but the relief when the stress is over (if that makes sense)
Jarring my neck
Although sometimes I get a migraine but there are no obvious triggers.
I have the same symptoms as many of the posters on here have described:
Disorientation, loss of vision, co-ordination and speech, people's faces looking blurry or fuzzy, tunnel vision, seeing zig zag lines, feeling and possibly being sick, extreme pain in my right eye and all around the eye socket, sensitivity to light, noise and the cold.
I take naramig and ibuprofen, and this helps take the edge off the pain if taken early enough.
I started getting 2 - 3 migraines per week about 8 years ago, had to give up all caffeine, and went on beta blockers for six months, which made me put on a few stone. 
Also, I used to suffer from quite bad rhinitis, and have been told that this can be connected with migraines.