Hi i have breathing issues and i think it's anxiety, it's happening from last week sunday, i went to casualty and they did a covid test, was negative. i cannot sleep, the breathing and heart pulpatations are getting worse, any advise?

Need to examine: It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Drink more water. Wish you good health!