Anxiety and panic attacks are due to high adrenaline (norepinephrine) surges. It underlies the flight or fight response, directly increases heart rate, triggers glucose release, and increases blood flow to skeletal muscle.It increases oxygen supply to the brain.Norepinephrine is synthesized from dopamine.
Sometimes adrenaline will surge about 2-3 am because the blood sugar is dropping. Low blood sugar can hurt the brain, so when the body can't bring up or maintain blood sugar (because of low cortisol hormones), it uses its' emergency backup- which is adrenaline.
If you have high androgen hormones it will release more adrenaline.
Low estrogen can cause it, and so can adrenal tumors.
If you are having a drop in blood pressure it will release adrenaline. Do you ever get dizzy alot when you stand from a sitting position? Have a lot of fatigue? You may have low blood volume, You may have tachardia, you my have hypoaldosteronism, or you may have POTS. You might be dehydrated which usually goes along with what i just described.. You can increase blood volume by drinking MORE WATER and put a 1/4 teaspoon of SEA salt in a glass of water every day and drink it down. The salt helps you "KEEP' you water and stay hydrated.
Finall, are you on any kinds of medication? There are prescription drugs that can cause this to occur as well.
In general, this problem is related to malfunctions in the HPA axis (hippo,/pituitary/adrenal.)The MOST COMMON reason for this is LOW CORTISOL comming out of your adrenal gland, AKA: adrenal fatigue. You may also notice you have some hypothyroid problems also (because the thyroid uses hormones from the adrenal gland).
As far as the asthma comment is concerned, asthma also has it's root involved in HPA axis malfunction.
You should get your hormone levels checked. Checking aldosterone , renin, and electroyltes should be done. Also a SALIVA CORTISOL test, as well as a one hour glucose test should be performed. NOT a fasting glucose.....and NOT a morning one time cortisol blood draw..These tests really arent as good as the ones I mentioned and can let problems slip by or give a false reading that things are ok.
Gail