As you expected, the mental changes came very soon after the physical changes. Instead of the intense headache or sudden and instant loss of self which you were expecting though, it was just a dulling numbness in your mind instead. "Not as bad as I thought." Although you could still somehow speak properly, your voice was much, much, much deeper and had a deep underlying and permanent growl to it like a thick accent. You were so surprised that you accidentally cleared your throat instinctively. "Issssssss thisssss betterrrrrrr?" Your eyes widened as you heard the much more pronounced growl but now accompanied by a hiss. "Nrooooooooo." You felt your tail lash around as you started to panic so you fought your instincts. "Nrooooo, need to rrrrrremain caaaaaalm." This allowed you to remain calm but only for a few moments until the numbness began to spread and the stress just kept building. "Focussssss. Haaaaave to focusssssssss. Caaaaaan't losssssse sssssssself." Even so, you soon realised that you were rolling your "A's" since each use was accompanied by an animalistic grunt. "Heaaaaaad ssssssso fzzzy."
Indeed, your mind was deteriorating so rapidly that entire parts of yourself vanished before thier absence could even register. "Pleaaaaaaassssssse, Nrooooooooo." Letting out a stressed growl, you despirately put your oversized head in your comparatively tiny hands and tried to massage it. "Pleaaaaaassssse, lrrrrrret mrrrrre rrrrrremrrrrain. Drrroooooooon't wrrrraaaant to dis-dis-dis-dis-dis-disperrrrr." As even your basic ability to enunciate words began to fade, you snarled as you felt your anger end panic rising to uncontrollable levels. "Ha-aaaaaaaarrrrrrd focusssssssss. Haaaaard ssssssspeaaaaak. Hurrrrrrrts." You crooned in distress as the strain of trying to speak in anything but growls and roars began to cause an unbearably sore throat. "Tthhhhhhrrrrrrrrrroooooasaaaaaat hhhhhhuuuuuurrrrrttttt." It took you several moments to realise that, between the sore throat and numb mind, your speech was beginning to regress into caveman speech which began to make you properly panic. "Nrrrrrrrrrrooooooooo! Nrrrrrrrroooooooooo! N-n-n-nrrrrrrrooooooooooo!"
You began gouging at the sides of your face with your claws until you regained control of yourself but the instincts have only gotten stronger in those few seconds. "Wwwwwwwwrrrrrrrryyyyyyy?" By now, the mispronounced and overly drawn out words were not just due to your worsening voice. It was actually becoming harder to remember how to speak and you needed a few extra seconds to remember the next letter. "Sssssssssstttttttttrrrrrrrooooooopppppp. Ssssssssrrrrrrrrrrroooooooo hrrrrrrrrrrdddddd ttttttthhhhhhrrrrrrnnnnkkkkkkkkkk" As you struggled to remember anything at all, your already horrendous eyesight seemed to somehow get even worse since you looked at a green... something crawling up the wall but couldn't make out what it was. "Wwwwwwwrrrrrrrrrrrttttttt taaaaaaaawtttttt...?!" With a confused croon, you walked over and sniffed it but then recoiled with a scared snarl. It took you several moments longer to realise that it wasn't your eyesight; you just weren't smart enough anymore to remember what that.... stuff was. With a terrified... something, you began pressing your... thing despirately into the... thing to... something. With any significant brain activity griding to a permanent hault, and your ability to speak coherently almost non-existent, you let the panic finally take over your.... your... "NRRRRRRRRRRRRRRRRRRRRRRRRTTTTTTTTT... RRRRRRRRRRSSSSDSSSDRRRRRRRR... NRRRRRRRRRRRRRRRRRT....SSSSSSRRRRRRRRRRRR..." As your voice finally deteriorated into little more than feral growls, you mindlessly and repeatedly slammed your head into the cave walls and gouged at them with your claws whatsoever although this was only making it easier to destroy your old mind. "RRRRRRRRRRRRRRRT.... SSSSSSSSSRRRRRRRRR! RRRRRRRRT-" With a final slam, the last of your thoughts disappeared and your final thoughts were completely incoherent even though you no longer had the braincells to register them. A massive female Giganotosaurus was all that was left of you who heaved for a few moments before throwing back her head for a deafening "RRRRRAAAAAAAAAAAAAAGGGGGGGHHHHH!" Now what?