I feel dizzy, weak and I have trouble breathing. Is this something to worry about?

Sure could be. You really need to be looked over. Please see your doctor right away.
Yes. You should go right to your doctor or an er. Trouble breathing is always something to be concerned about. That said, these could also be symptoms of something as minor as a panic attack. It's impossible to tell for sure by the question alone. You need a doctor to help you figure it out.