I can tell you from experience that you are suffering from severe anxiety. It will always be the worst in the moments when you are in between sleep and awake. But awake enough to be aware.
Do you live where there is ragweed blooming? It is blooming in many places in the country right now. I used to have horrible problems with anxiety and panic attacks, the two are different, and was treated for them like it was a mental illness. Then it dawned on me, after years, there was a pattern to when they were occurring. The worst were in the fall(ragweed pollen) and there were milder ones during the spring.
Humidity and heat made them far worse. I finally figured out that allergies were causing mine. I suspect because of the timing of yours, pollen could be a culprit and the summer heat and/or humidity. I use homeopathics to treat mine and L-theanine (amino acid that calms) and other natural things.
The homeopathics, I just bought three boxes of them tonight from GNC(Bio-Remedy Allergy & Sinus Relief), I keep right by my bed. If I wake up panicking, I turn the thermostat down, drink some cold water, and take a homeopathic tablet. I continue to take the tablets every few minutes until the symptoms fade. I also take two L-theanine, the suntheanine kind immediately if the panic or anxiety is particularly frightening.
Anxiety, which is not panic, will last all day and vary in degree. It will feel like impending doom and you will find you cannot watch certain movies or listen to certain music. I walked out of the movie Mars Attacks during a particularly bad bout of anxiety that lasted for four months. I had to get treatment from the doctor for it. I still get that type of anxiety if something is worrying me severely. This kind of anxiety will come through you like a wave and you'll feel very weak, even faint. I will try to treat mine naturally, I know a few things that help. But if it's severe or prolonged, I go to the doctor for help. No sense in suffering emotional pain if you don't have to. I don't recommend Prozac. It can cause sexual side effects. Zoloft works better for me. The problem is, different meds work for different people and then others don't.