If cortisol helps then look at the underlying mechanisms of action by which cortisol works in the body. Could be it’s anti-inflammatory and anti-stress biological effects in the body, or others. There might be alternative treatments that can target these same pathways without resorting to steroids like cortisol, which as a class of medicines really cannot be taken long-term at almost any dose, if you are within normal range without them, without causing detrimental consequences.