Friend might pull out of trip last minute, what should I do?

So, a friend and I have had a trip booked for months. Hostel, flights and everything. They've just told me that they might have to pull out due to health complications. We're meant to be flying with Easyjet, but I don't think they're refundable, and I don't think we'll be able to get the room deposit back as well. Idk what to really do in this situation, that was a lot of money I've lost- and they've said that they'll pay some of it back- but that's under the impression we get a partial refund. Is there anything I can do in this situation? Will I be able to get any money back? If I can't, do I just say fuck it and go on a solo trip? I've never gone on a solo trip before, so idk how well I'd do on one...