Championships tomorrow

Tomorrow is a big day for my Martial Arts club as it will be championships day held at Lightwaves in Wakefield. I have entered myself in for Karate point stop sparring and Kick Boxing continuous sparring. I am not a competitive person however I do enjoy sparring.
My only experience of competition in martial arts is when the club held a mini tournament last year and I managed to come first in the Karate Point stop sparring. This however was just a taster and I am told that the championships is a much larger event with many more competitors.
I am incredibly nervous, not of getting hurt but of my fitness levels and adrenaline getting the better of me, last years mini tournament almost killed me. I struggled for breath after each fight but I am hoping this wont be an issue this year as I should be much fitter than I was back then.
This will however be the first time I have fought competitively in a kick boxing event, I almost didn't sign up to the event due to nerves but deep inside I knew I would regret it tomorrow if I let the opportunity pass me by. I am 39 years old now and I imagine I don't have many more years left whereby I am going to be able to to fight competitively.
My son has also entered the karate point stop event as he too was quiet successful in last years mini and managed to come 3rd.
I will be taking my phone tomorrow with me so my wife can video the fights, I will post again either tomorrow of later on in the week with an update.

Photos are from last years mini tournament.