Yeast infection

I am 30 years old and I have never had a yeast infection until now. I have the burning, itching and thick lotion like discharge. I recently was on steroids and had to change my diet to pretty much all carbs. I was also on vacation and had way more sex than I usually do so I know that’s all lead me to a yeast infection. 🙄. And holy shit I am dying. Like almost called out of work. My whole vagina is swollen and burns and I’m going nuts trying not to itch. I had to sit on an ice pack the other night for some relief. I tried using that 24 hour one dose monistat stuff and it seems to have made the discharge better but HOLY HELL the burning is unreal. Is this normal??? All the yeast infection commercials make it seem like a yeast infection is a minor inconvenience but this shit is horrible. What else can I do to make it better? How long does it take to go away? At what point do I get my doctor involved? 🤦🏼‍♀️