Stress will definitely cause numerous physical and mental problems......it is a VERY unhealthy place to get stuck.
I understand that you are overwhelmed with the demands of studying and testing, but it really is imperative that you MAKE time, EVERY DAY, to do SOMETHING to de-stress. In the time it took you to find our Website, log in and write your post, you could have done 1/2 an hour of Yoga or taken a 15 minute walk, or talked with a friend........anything that will get you to close the books and yes, I'm going to say it.......STOP AND SMELL THE ROSES!
By doing this, by taking some time to let the stress and pressure go, when you go back to your books, you will be mentally and physically refreshed and able to more easily absorb what you're studying.
ONE of the problems with stress is that after a certain amount of time, it doesn't just go away when the stressful task at hand is finished. It has now become part of our mindset and it affects how we approach virtually everything. A perfect example of that is when you said......"I think I am having unconscious stress at this moment." I don't THINK you are, I KNOW you are! And all you're doing is taking a few minutes away from those damn books to search for some advice.
You're not exercising, you're not getting enough sleep, I will presume you're not eating as well as you should be, I would bet the rent your menstrual cycle is messed up due to stress, you are undoubtedly fatigued, I think you're dumping guilt on yourself for doing anything besides hitting the books, for sure it doesn't sound like you're having any fun.
You say you don't know what happened to you or what you should do. I can't be sure what happened to you either, but my guess would be that the competitiveness and unreasonable pressure that has been put on young people these days to TEST WELL on TOO MANY TESTS is triggering your stress. I don't have a ready answer for what you should do to change this. I might suggest you set aside a certain block of time that is "study time," and a block of time that is "ME" time. You need to find a balance of buckling down and letting it go. For your health, you really need to do that.
Study hard and play hard.
You don't mention how old you are, but from high school through college who sleeps? It's the normal state of things. How stress affects us depends on the person and the source of the stress -- stress from doing things you really want to do and are passionate about affects you differently than stress that's either irrational (from nothing discernible) or from negative forces in your life. Just to give you something to be positive about, US presidents live really long lives usually -- again, it really depends on whether the stress is coming from real things you really care about in a positive way or is self-imposed and from negative things in your life.
Thank you for ur response!
Thank you for ur response!