well, i think you would be amazed to see how much of the US feels the same way as you do on a daily basis. this is really the condition of western culture rather than some strange undiagnosed disease.
how many people do you know who are happy, grateful, and at ease with life?
i don't think that you have any "medical" disease. i think like most people you are probably feeling overwhelmed, unsattisfied, confused, and a little scared of the condition of the world around us. it is completely normal to feel this way.
not that long ago, people used to live from the earth, spend time working outside every day - having both regular exercise, sleeping schedules, and an unbreakable connection with nature.
now we are locked inside in front of computers for most of our solar days, we eat junk, we don't exercise, and we watch terrible things happen on the news.
even if you take the healthiest person in the world and put them in this grind, they will become depressed and anxious about things.
the only thing you can do is to gather the strength within yourself to seek inner peace and balance in your life regardless of the conditions around you.
do you exercise? do you spend time with people that you love? do you eat healthy? do you strive for something beautiful in life?
all of these things come together to form the quality of our experience of life, and as long as we allow the world to intimidate us - it will.
we have the choice - and that is to remain paralyzed or to try to bring peace into our life and the lives of those we love.
i know how you feel, and often i feel it too. it's only a sensation, and there is hope.
does any of this make sense?