Hey Bekah! October is an amazing time to visit WDW.
Since you're staying at the Wilderness Lodge, I think that you should check out Storybook Dining with Snow White at Artist Point! It seems like the perfect fall restaurant, and it's been pretty widely acclaimed since it opened last year. I also agree with
@Wild4Walt that you should check out Disney Springs! Unfortunately, Bongos will close in August, but I recommend Chef Art Smith's Homecomin' or the Boathouse for lunch or dinner.
I personally think that
MNSSHP is worth the extra cost, especially if you go on a weekday, as those parties are generally less crowded than the weekend parties, and especially if you love the "lighter" side of Halloween! There's a fun castle show, a parade that I absolutely adore, plenty of free candy to go around, some great character M&Gs, and of course: lower than average wait times for most of the rides! While I always think it's a good idea to watch vlogs or reading blog reviews to decide whether an event is right for you or not, I can pretty safely recommend MNSSHP!
While you're there, you'll also have the chance to enjoy Epcot's Food & Wine Festival, my favorite event at WDW! You can attend seminars, enjoy special food offerings from booths around the park, and enjoy live music during the Eat to the Beat concert series. I definitely don't think you should miss Food & Wine!
If you want this trip to be extra special to celebrate your recovery, there are a few more experiences I'd like to recommend. Dining at the California Grill, especially for Sunday Brunch, is a Signature Dining Experience like no other. It's romantic, intimate, and upscale, with stunning views of the castle. Victoria & Alberts is another dining experience to look into, although I can't speak from experience about it. I would also recommend looking into one of the backstage tours that the Parks offer for an unforgettable and unique experience! I don't know which tours will be offered when you're there, but Keys to the Kingdom is a popular one, and so are several backstage tours in Animal Kingdom.
I hope you have an incredible trip! Congratulations on your progress!