Yes, I was the same way. My limbs felt weak and fatigued, which worried me. But, it's nothing to be afraid of. When you experience a panic attack or a string of anxiety symptoms, it take a (temporary) toll on your body. I know I had such a bad anxiety attack once, it lasted for days and my body felt like it had been hit by a Mac truck. I assure you this is normal for what you have been through. Your body is literally exhausted. It is coming off of a long, stressful road that is an anxiety attack. Obviously, you know anxiety attacks cannot kill you, but they will make you feel like you are dying. Like the "heart attack" feeling. Your body is just in recovery mode from it all. No worries!