Its been a week now, that i can't sleep at niight.. i feel sleepy and very tired, but i can't fall asleep. im anxious all day.. feels like i can't breath?

Requires evaluation: Your concerns merit a thorough evaluation by your physician.Such problems as anxiety, or mixed anxiety/depression, a number of pulmonary conditions, and hyperthyroidism are but a few.

Insomnia, Anxiety: First please get a complete physical exam from a Medical Dr. to find out if there is an underlying medical illness. If not, then it would be good to consult with a Clinical Psychologist to learn the reason for your anxiety and get help for it, additionally maybe a referral for a sleep study and/or medication.