Why do you think it is a good idea to take a few days off? I am a Goenka practitioner myself, and I've regretted all the "breaks" I've taken from regular practice. Now I practice an hour a day and have been trying to get back up to 2 hours, as recommended. I don't know how far you've gotten into MCTB, but from the way you were describing your sits it seems like you were in the A&P (waves of sensations, overwhelming, euphoric) and you have now passed into Dissolution (euphoria is gone, feels kind of raw, don't really feel like practicing, things feel done) They are stages 4 and 5 on the progress of insight section in MCTB.
Not practicing consistently always leads to a "regression" in my practice, and I've personally observed that when I don't practice I can feel my mindfulness and equanimity slowly but surely deteriorating. I'm sure there were times on retreat where you felt uninspired to practice, but you did it anyway. And I'm sure you're aware of how a "few days" of not doing anything can turn into weeks, weeks into months, etc.
Really helpful page about stream-entry from a Goenka perspective by a member of this forum:
Stream Entry on a 10 day goneka retreatMetta
Maher