Alright. This is a lengthy read, so thank you to all who do so. If you want to skip the back story, just head to the last paragraph. 
The good news: I now understand all of the anxiety that I'm experiencing and why it is happening. 
The bad news: its now a bit of a  vicious cycle.
I started feeling anxious back in like February/March. I was working a new job, getting up early every day for months, but still going to bed very late. I was running off of maybe 4-5 hours of sleep each night. I also started consuming caffeine 3-4 times a week, because every single day I was on the road I would treat myself to starbucks. This was also when I fell off my diet and I stopped walking every day. 
Tie in the fact that I had some stress from an outside situation. 
My stress heightened from all of that and I started experiencing depersonalization again for the first time in 8 years. 
The depersonalization in addition to still not regulating my sleep or treating my body well lead me to getting anxious every time I left the house, for fear of being anxious. 
Over the summer, I started to feel better because I was sleeping better, and getting exercise, but then it got bad again when I got really sick in a foreign country because the experience was so scary. 
Flash forward to like September, throw in the more stress from some creative deadlines, and I have basically stressed my system so badly that I have now gotten to a state of adrenal fatigue. Which basically means that my body has no idea when to release cortisol. So I will now randomly get heart palpitations, tremors, the extreme fatigue, and I'm having all of these sleep disturbances and waking up every 2-3 hours (which has never happened before in my life), nightmares, and I regularly start to panic during hypnopompia.
I'm really sick and tired of it. 
I miss being able to sleep through the night and have my anxiety under control. And aside from some outside stress, this is 100% my doing. I've made myself unhealthy and it's really unfortunate. 
The solution seems to be: trying to rest and regulate my sleep as much as possible, avoiding processed foods as much as possible, taking some vitamin supplements, low impact exercise, meditation, consistent water intake, and adequate lean protein consumption. 
My options are to get my shit together or to suffer. I'm going to get my shit together. 

My biggest issue currently is that I know sleep is the remedy, but because my rhythm is so off, I'm waking up every 2-3 hours (sometimes less) in a full panic. Like I go from my half asleep state, to awake, sweating, heart pounding, and feeling like I'm going to die. Not always from a nightmare either. So I need to sleep to fix my anxiety but I can't sleep because I'm anxious. Has anyone had this? And cured it? Any recommendations? I worry about taking melatonin because I know it can cause nightmares. I just want a good night's sleep so badly, and I know I need it to fix this.