Get off the stims ,tolerance is maybe to high now so they don‘t affect you anymore.
Take 2 weeks complety off them and after that you should be fine again with lesser dosages .

Pre Workouts for studying is a bit over top my man,sure it depends which one but still:milaugh:
some contain 450 mg coffein per serve of course you get increased heart rates
Premature heart attack, yum🥳
 
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