Itching and scratching around Groin area

Suffering from extreme scratching and itching near groin area, walls of scrotum and inner thighs. Already taking Doxycycline 100, Bilashine Tab and applying C-WIN cream besides Liquid Paraffin since 20th April based on doctor prescription. Medicines prescribed for 1 month but no relief till now. Taking medicines religiously without break, cleaning the region with hot water twice daily and keeping it dry. When there is even a little sweat scratching starts again and is uncontrollable especially at night resulting in loss of sleep. I am also unable to wear briefs (Even the trunk types) because after a while the inner thighs (back portion) starts to itch. Not sure why there is such an increase in fungal infection all of a sudden. Please please help me by suggesting if the medicines I am consuming is strong enough or do I have to take some other medicines too. Kindly let me know the average duration for my skin to become normal again.