Attention need fight advice !!!

4 weeks ago I won my first Amatuer fight on a Unaminous points Decision against another amatuer fighter who has had 6 fights and 4 wins. Is it a good idea too fight oppenents with the same number of fights, as i was told that i shouldnt of fought this oppenent because it was my first fight and he had much more experience than me. .?????? I fought at middleweight which is 75kg, and I really struggled in the ring on the night as even before the fight i felt sluggish, drained of energy and power. I had caught the flu 4 days before the fight. I was on antibiotics leading up to the fight and I also struggled making weight, though i weighed in at 73.0 kg I skipped two meals that day leading up to the fight, which I now Know was very stupid. Another trainer told me maybe I should weigh in perfect at 75 kg and if im a little over to skip for a round or so then weigh in again ????? This was so i could eat well leading up to a fight . . .So I dont feel flat I sit naturally fit at 74 kg. I am 175 cm in height and I am naturally a big boned person and find it hard to make weight though I think light heavy weight in amatuers is under 81 kg and my oppenents would be a bit too big for me ???????????? Any help or advice much appreciated. . . . Diets ??????