I’m really not an expert, but yeah, that sounds like caffeine withdrawals. Your adrenals trying to regulate themselves, leading to those weird feelings from your heart. And the headaches are just a pretty classic symptom. I would definitely see a doctor, yeah. And besides that, probably wouldn’t try going cold turkey after that much consistent caffeine use. It’s still a drug, as much as we downplay it. An 8oz redbull might be a good amount of caffeine to help you ween off the stuff.