I have been having tachycardia in my sleep which resolves once I wake up (usually in a panic and short on breath). My doctor gave me inderal to help control this, but I am scared that I have sleep apnea which may be causing this to happen to me to start with. I am not sure what to do because I cannot pay for a sleep study at this time, I have no insurance or money...so I was wondering, would it be dangerous for me to play around with inderal with not knowing of my true diagnosis?