Yeast infection? Help!

Okay, so every time I take antibiotics. I get a yeast infection. Well, here I am and here it is. I did monistat three day. Five days ago. It didn’t seem to help. I feel swollen down there and it burns. I did however have sex last night. Stupid. Yes. I know. So I know most the burning is from that. Plus, I am now spotting. Not when I pee, like from inside me. What else can I do to help? I am so miserable with the painful burning feeling and itching. It’s driving me insane.