Hello KR and welcome to HW.
Glad you found this site, you will get great advice and support.
I am not a professional but here is my theory of what may have happened. It's a given that energy drinks will raise your heart rate and some people become very sensitive to body sensations.
For example...If you feel your heart beating fast and or hard it may make you uncomfortable, at that point it makes you feel tense and it triggers your brain you are in danger...like in a crisis that doesn't really exist...so in return your brain reacts by flowing adrenaline. Once that happens it is common for your chest to tighten..which may cause you to breath fast or shallow, causing some dizziness or tingling or whatever.
This begins an anxiety cycle. Constant thought about what happen, will it happen again...what if this? what if that? The brain becomes overwhelmed and needs a break and instead we constantly dwell on our condition. Anxiety is fear driven, it exist only from the attention that you give it.
As far as it coming out of nowhere, very common. Is it all in your head, yes. Is it a mental illness and will you go crazy...no and no. It is a disorder and it's developed from what some call warped thoughts or unrealistic thoughts.
Here is what worked for me and many others....Your body is working perfectly, when a crisis occurs our body goes into fight or flight mode....when we have unrealistic thoughts and or worry and fear thoughts....it triggers it to do the same thing....problem is, there is no real crisis, so we dwell on it and instead of the adrenaline subsiding like after a crisis is over....we keep dwelling and it keeps flowing.
The answer is, do not try to push anxiety away, don't try to resist it, don't try to control it or get a grip on it and don't avoid things you normally do. All these thing require you to think about it that much more continuing the cycle. Panic attacks feel horrible but you are not in danger, your body will endure it and it will and always does pass. Embrace that thought cause you will need to face your fear head on in order to break the cycle.
If you feel it coming on, just roll with it....nothing else. It will pass much quicker and by not trying to stop it in anyway, you don't feed it and make it worse. This begins to break the cycle. It takes time and patients, but it works. If you avoid going and doing something because you are afraid it will happen there, you are giving the anxiety respect, fear and worry and you are feeding it and will never beak the cycle. Except that you may have a panic attack but because you are just going to roll with it and know that it will pass and that you are not in danger.....the symptoms will be less intense, shorter and much more tolerable and at that point you are on your way to breaking the cycle and to recovery and yes...given this method I personally believe anyone can recover completely and many do.
Sorry this is so long, but it's not a short answer to fix this. This is only my personal opinion and probably not well received by others. I recently have changed my thinking and it has had a huge impact for me to make it better. For more than a dozen years I have used what we call coping skills like...breathing from my diaphragm, relaxation techniques, thought diversion and on and on...with that said, it is important to breath from your diaphragm and not your chest...everyday all day...it's just the proper way and certainly will help in a anxiety event or panic attack. We should always use some method of relaxation on a regular basis, the world is full of stress and we need to let it out...that is for people that suffer and even one's that don't.
But what I have come to realize is coping skills do not break the cycle....excepting anxiety and not giving it respect and attention is key. I used to feel it coming on and go into coping mode and run through my check list of what to do to calm it....this was my mistake. Now If I feel uptight and a bit weird....I just say to myself "bring it on" and I don't try to stop it or control it or get a grip on it...I simply know that no matter what.... I am OK and safe and I give it as little thought as possible on what I need to do or how I need to feel.....this has made a huge difference for me......enough that I recently have been doing and trying things I haven't tried in a long time because I am facing the fear and excepting how my body feels and it is diminishing my anxiety greatly..... I really hope some or all of this helps. Give your brain the break it needs to recover by not keeping yourself in the cycle........Best of luck and good wishes..............WM