Bad day at the office, Punch resistance

Hey guys sitting here VERY thustrated after last nights sparring, I guess we all have good and bad days but yesterday i dont know what the hell was up with me.. this last couple of years ive been working so hard to achieve my goals and ive came off a couple of my best performances in the ring at the ABAs so youd think id be at my best but lastnight at sparring i was effing awful never so bad in my life.. i was taking too many shots from novice boxers and guys that i can easily deal with normally were catching me all over the place.. and not just that i felt every punch too, i didnt show it but a few of the shots i caught buzzed me.
now i havent sparred for 3 weeks, i have still been in the gym non stop but i had a lump on my head from my last fight which i didnt want to become a cut... so do you guys think that could be why i was rusty 3 weeks off sparring probably the longest i havent sparred?? also i am training for a half marathon tomorow which i have been drinkining lots of water this week but i thought that is meant to help with punch resistance?? i by no means get wobbled easy but just seemed to feel the punches yday more then usual, hopefully just a bad day any advice i will appreciate loads cus i work so hard i get really pissed off when a bad day like that comes along atsch

 

fair one but having a glass jaw doesnt explain why i had the timing of a sloth!

 

thanks for a decent reply mate yea i had to cut a fair bit of weight for the ABAs i had to get down to 64kg from 68ish not too bad but 3 weeks on i had put weight back on so not sure that would have been the issue but thanks i see what you mean my head wasnt clear because i was getting more and more thustrated hopefully just a bad day because of not sparring for 3 weeks