Man sounds bad. Hope you feel better fast, I hate feeling sick; nothing like it.
I've never done gatorade, mom usually had me on Sprite or Ginger-Ale, take your pick. Un-colored, and of course no caffeine is important. These are good (better than gatorade? I don't know) because they are more acidic and thus match your stomach PH better. Less upsetting etc.
Of course be sure to sip, and only sip, just a little. See if you can keep it down, and sip again every 15-30 minutes.
If you're able to keep that down for a while then Saltene crackers are a good simple food to start back on. Chicken noodle-> protein might be rough, I don't know.