How bad can my sprain get, and how fast can I fix it?

I sprained my ankle running cross country, preparing to go to MCRD basic training in less then a month (in 24 days). I can't go to the hospital because my insurance ran out, so I can't afford it, but it's just a sprain, so it will heal in time. (I had a jarhead moment and decided to run on it anyway, everyday for a week...) Now it's swollen and hurts when I walk. I've been off it for several days now, and it seems a bit better, but still hurts when I walk. I have been using Ibuprofen, icing, mineral icing, sleeping with it propped up, and wrapping it when I walk. I need to speed up healing, so I don't miss my ship date.

So I need to know how I can fix it, and how bad will it get if I ignore it?

I can't miss this, and don't really care if my feet fall off in the process, but would really love to keep them if I can, I am kind of attached to them after all.

Any Ideas on how to speed up the process would be helpful.

Thank you!