I barely slept blast night, i was stressed and did not stop thinking, i had worked hard, today i am weak and vomit many times, what it could be ?

Anxiety & stress: Anxiety and stress can result in all kinds of physical and emotional symptoms, including these. It's important to tell your doctor about any new symptoms, so that s/he can review your health for physical problems. Working with a psychologist may also help you uncover & deal with the reasons for your stress. So that it doesn't run your life. Relief is possible!