Hi Abhi, I am sorry you are going through this right now.
From your symptoms and such, it sounds like you are describing jock itch. I would suggest more 'gentler' methods first before trying anything serious. OTC anti-fungals should help, but what is more important is keeping the area moisture-free and clean/hygienic. Not wearing tight underwear and avoiding 100% cotton underwear, combo of hydrocortisone and Lortrimin (clotrimazole), and washing the groin area at least once day (but not more than 4) should help to rule if there is something else going on. Often times, especially men who sweat a lot, moisture gets trapped into those areas easily and wreaks havoc on the skin while making a fantastic breeding ground for other critters in the world.
Hope this helps.