Aviation is by it's nature a stressfull career.
Some manage to handle it without difficulties, others find various means of coping, whether through sport, a round of golf, alcohol, or medication, often self prescribed.
Others adopt a laid back attitude and just do things at their own pace and refuse to be hurried and bullied but this is more difficult nowadays.
Going down the road of taking tablets to relax is not something to be done lightly before exploring other avenues such as counselling, or even moving to a less stressful position such as changing from longhaul to shorthaul, or aircraft type, or base. It isn't worth letting it ruin you life, and all medication has side effects, sometimes almost as bad as the condition being cured.