Muscle Tension

Has your anxiety manifested as bad muscle tension causing all kinds of pain and stiffness? I've had anxiety for over 15 years and suddenly started getting this symptom. I noticed I'm always like so tight like I'm always bracing to be hit. I have to force myself to relax. It's really hard and when i do relax that part I'll end up tensing something else like my jaw or clenching my toes or hands. Right now I finally started my MA program and I've been extremely scared about it and always thinking I'm going to fail and that I don't compare to my classmates. :/ I think it has something to do with this so I listen to imposter syndrome videos which help but only for short periods of time. I heard your body can become accustomed to holding the muscles tense after prolonged tensing. I'm worried my body is doing this. :/ please let me know if you've gone through it or are going through it. I'd like to feel not alone