Anxiety, Breathing Difficulty Nervousnes

Hello, I am a 15 year old. I have been having these symptoms for a few days now. Symptoms: Extreme Anxiety for no reason, Difficulty Breathing, Muscle Tension and Twitching, my sleep doesn't feel like deep enough and feels like I barely blinked and woke up and also my sleep broke two times last night, I also worked out once some weeks ago and after I took a bath with some cold water all my muscles suddenly became extremely tensed and I could not move because if I did then they would become tensed and I would feel extreme pain and felt like it was a cramp and they become very tight for a few seconds. I only get relief when I am lying flat on my bed. My arms also become numb during sleep and i have to straighten them to stop the numbness. I visited a doctor and he said I had some weakness and required a balanced diet. I can't workout now because my muscle tension problem comes back along with some of the same Symptoms like breathing difficulty.