Makeup artist cancelled a week before my wedding and I’m so lost

I am actually freaking out and could really use some advice. It’s too short notice so I have been rejected by almost every artist in my area (small town, basically no options) so I have come to the decision that doing my own makeup will be best. I have like a 350ish dollar budget provided by my amazing fiancé to help me get what I need! What I really need advice on is my base/foundation. I have EXTREMELY oily skin, nothing I do really helps. I have pcos so it’s more medical than anything. I know that either way I’ll still look somewhat oily but I’d love if anyone can give me recommendations on skin prep beforehand, foundations, and concealers I should use to help for a flawless finish look. Thank you in advance if anyone can help.