Without a diagnosis, it is a little hard to say whether the paw will heal on its own. I am certainly glad to know that there are no obvious injuries, such as a cut and moreover bleeding.
There are times when cats can jump and injure themselves...a soft tissue or muslce strain, sprain, or bruise.
There are other times when cats can break (fracture) one of their little toes, and although they are quite stoic and do not cry a lot, then tend to limp primarily when this happens.
To make sure there is not a break or something more serious, I would recommend veterinary evaluation
Your vet can take a close look to make sure there is not a wound or infection and even consider an x-ray to look at the bones.
Until then, just to be more thorough I tend to not recommend over the counter medications for pain in cats such as ibuprofen, aspirin, and certainly not tylenol as they can cause severe reactions in cats.
Moreover, my suspicion is the belly issue and the flies are completely unrelated, but your veterinarian can take a look at the belly as well during the general examination.
I hope this is helpful!
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The above is given for information only. Although I am a licensed veterinarian, I cannot legally prescribe medicines or diagnose your pet's condition without performing a physical exam. If you have concerns about your pet I would highly advise contacting your regular veterinarian.