I hear that one becomes very clear minded and energetic as a result of the experience but I don't know if this is directly after the experience or in the days that follow or what.
For me it was directly after each experience...all 3. My brother struggled a bit, but still hiked for an hour or more 10 minutes after the experience. You will be fine. Are you applying yourself? The first time I tried was difficult, but the second time I had it down pat. If you have any questions ask KIAP or if he is bust (traveling, etc.) I can guide you through it.
BTW....it ain't THAT bad, and yes, you should be really in tune with your surroundings afterward. How many dots are you applying and where?