Yeast Infection

So I’m pretty sure I have a yeast infection. My discharge (not to be disgusting) is thick and lumpy, and that part of my body is often very itchy (and sore because of the itchiness).

I’ve been reading that Monistat can help with this sort of thing, and I was only able to find the one-day treatment.

My questions are:

1. Do I, indeed, have a yeast infection? (I’ve never had one before)

2. If I do, can I use the one-day treatment, or would it be better to use something else?

Thank you for anything you guys can answer/suggest! 😊