I am very sorry; but a vet trip is your only option.
There are several urinary tract problems that can present with the same symptoms:
- UTI, urine infection that is caused by faecal bacteria getting into the urinary tract
- bladder or kidney stones and sludge - hence the scan, which is the next step
- cystitis, a non-bacterial inflammation of the bladder walls. Cystitis can be caused from the irritation of a stone, sludge or sharp crystals in the bladder.
- interstitial (i.e. recrurring) cystitis, IC, has become a lot more common over the last decade; so far it cannot be healed and can only be diagnosed once you have excluded all other problems. We do not yet know what is causing it and can therefore only treat the symptoms. Antibiotics can only temporarily suppress it at the best; the acute phases every few weeks are usually treated with an analgesic (anti-inflammatory cum painkiller like metacam) and extra glucosamine to help protect the natural glucosamine coat of the bladder walls.
The good news is that IC doesn't cause stones, doesn't kill and eventually goes away on its own, never to return. But it is more a matter of years than months. I have however had several piggies that have lived to a good old age despite suffering from IC for 2-3 years.
Your vet also needs to check whether there are problems with the reproductive system in a sow (womb or ovarian cysts). Again, a scan/x-ray will bring clarity.
We have got diet recommendations for guinea pigs with chronic/recurring urinary tract issues. These DO NOT replace a vet visit; they only help to minimise the formation of stones and remove food groups that are not good for IC piggies while still providing a balanced long term diet.
Long Term Balanced General And Special Needs Guinea Pig Diet
Here is our recommended vets locator. An exotics vet will always be more expensive than a general vet; but by far not all general vets are conversant with guinea pigs/rodents and their specific problems. No frills vet chains can be reluctant to prescribe medication that is not licensed for guinea pigs.
Guinea Pig Vet Locator