Firstly, it needs to be clarified whether the tension is physiological or pathological.
For physiological tension, medication is not usually required. The tension stems from the unknown and since it is unknown, one needs to convince oneself that one should not stop in speculation and fear, but should look at it rationally.
For pathological nervousness one can seek help from an internist or psychiatrist or a psychological counsellor for allopathic treatment, medication combined with psychotherapy, etc.