Soft tissue dysfunction and discomfort add to anxiety. As well as just being uncomfortable we can, for example, confuse muscular pain between the shoulder blades with panic attack pain. The difference here would be that panic attack pain would usually be in the front of the chest and Rhomboid, Trapezius and Erector Spinae discomfort would be at the back. The pain is similar and easily confused. Bad posture can cause this.
As the illustration suggests, sitting for too long and in a bad position can weaken and shorten muscles. When sitting, especially if the feet are under the chair the hip joints will be slightly twisted, causing problems in the gluteal muscles (butt pain hip pain). The Hammestrings are also in contraction for long periods. This tends to shorten them which in turn pulls down on the hip/sacroilliac joint, which in turn causes lower back pain.
As the gluteal muscles (especially glute maximus/big butt muscle) is out of play because of the sitting posture, the erector muscles which hold the spine straight are constantly working overtime on their own. This is because they are getting little or no help from the ‘glutes’ or hammestrings in stabilising the lower back and hip area and so try to do everyhting on their own. No wonder we get back ache.
The hip flexors which attach to the lumbar vertebrae and the top of the femur (top leg bone) also tend to tighten up/shorten and weaken. The quads then overwork to compensate. This may cause discomfort in the front of the hip, around the knees and side of the hips.
Basically if you let your hip area get out of balance then you will get no end of back trouble. Anxiety comes with many physical complaints. Aches, pains and fears of every description make life difficult. To keep physically well is to help the mood. This will help the mind think straighter and not go immediately to the worst physical scenario.
Use your muscle, keep the range of movement, stretch when appropriate. Consult a healthcare professional for a program of action and get disciplined. Easier said than done I know. But very rewarding.