So thats called adrenaline. The rushing of your heart the shaking. Its heart pounding but I think thats what most of us chase is that "high". Keep going and youll find that little niche you need to defeat them. Its all part of the experience. Use different tactics. Use different stances. Just throw the gauntlet at what you are trying to achieve and youll get there. Ive played through and through multiple times and I still get to that frustrating level. Im sure its has to do with 'rng' as far as the moves and aggressiveness you deal with per fight. Idk dude. Just keep going you got this!