Another vote for more protein! I'm hypoglycemic too, and have learned the hard way what I can and can't eat. I'm the girl that if I eat a bagel for breakfast, I'm on the floor unconscious by 10am.
For breakfast I'd try a protein shake if you're in a hurry, or eggs. If you're in love with cereal, Kashi GoLean has protein. You might be able to keep having oatmeal if you make it with whole oats or Irish oats, and make it with milk. Maybe add a little peanut butter or nuts on top, and skip the fruit. Maybe you can keep the fruit if you switch to berries - more fiber=less sugar spike.
For portable protein-acious snacks -
Nuts! I still need to buy the 100 calorie packs of almonds - I'm still working on portion control.
Cheese sticks can stand up to a few hours out of the fridge.
Protein bars are easy - Atkins has several "daybreak" bars that have 10 grams of protein and 150-200 calories. Luna protein bars are tasty, too.
Hard boiled eggs
Roasted chick peas - drain & rinse a can of chick peas, spritz with olive oil, season however you like, roast on a cookie sheet for 30-40 minutes at 400 degrees. They rattle when they're done.
You might want to check out the South Beach Diet Section for some more ideas.
Good luck - you've done great so far, now it's just a matter of tweaking to where you feel good.