If it really is blown, your foot is effectively now disconnected from your leg and will be floppy. My parents have both snapped theirs and were in plaster for 8 weeks each. If you have a walk in or OOH place, might be an idea to pop in.
If you just strained/partially ruptured it, you need rest, keep off it, it may take some weeks to resolve. You should try to rest it as much as possible-advice from my GP when I strained mine from mounting from too low a point onto a 16.3hh TB.
I hope you heal quickly, it’s a swine to deal with, my left is permanently strained due to compensating for the crappy right leg.