The stages of Intro can be gone through as fast as 2 days each; you stay on each longer only if you still have diarrhea happening (if that was one of your problems). No reason you can't be having tasty meals by now (roasts, stews, even grilled meat should be up soon; citrus fruits shouldn't be more than a day or two away either, IIRC).
You shouldn't expect to see symptoms like allergies going away immediately. It would take more time, almost certainly.
GAPS did a tremendous amount of good for our family, and ultimately, helped us to decide what level and types of grains we can serve our children. We came to not having wheat, ever, but having quality corn, peas, rice, etc., once in a while. Certainly not weekly. Some of the things we saw go away:
borderline Oppositional Defiant Disorder
Tourette's syndrome (went from constant in three of our children to just occasional)
excessive ear wax (talk about unexpected!)
and much more
Some of these were primarily from going 100% all-the-time wheat-free, but others were not. The ODD change was dramatic and permanent. This child is still my most resistant, but nowhere near the constant battle he was. That change happened in two days of Intro. Others took longer or much longer.
5'4" 39yo mother to five sweeties & married to their AMAZING DaddyGrok
Current Weight: 175lb__________________________________Goal: 135lb
Deadlift: 240lb________________________________________Back Squat: 165lb
Bench: 130lb__________________________________________Pre ss: 85lb
***Winning a 20-year war against binge eating disorder***