Increasing urination to help flush out bacteria is very important. Provide bowls with salt-free (or low salt) chicken, beef, or fish broth as well as fresh water, and an additional bowl of cranberry juice. Cranberry juice (or cranberry in tablet or pill form) is helpful because it acts in the bladder to prevent bacteria from adhering to the wall, increases the acidity of the urine, and contains important antioxidants; and this can be done before going to the veterinarian.
Acquire a fresh urine sample to bring to your veterinary appointment. Your veterinary will perform a urinalysis with sediment for proper diagnosis. If crystals are found in the urine than an X-Ray of the bladder should be performed to make sure there are no uroliths (bladder stones) in the urinary bladder. Hopefully, your dog will not have crystals. Occasionally, a dog can have urine that is too acidic and can produce stones that are only formed in acidic urine, in this case too much cranberry would be contraindicated, but this is unusual.
Dog's who are well house trained can be anxious if they have accidents in the house. Please do not scold her if she does happen to have an accident in the house, since it is not her fault.
No there is not anything that you can give her at home. The good news is that we , in the Vet community, do not think that dogs feel the horrible anxiety and need to pee everey few minutes like us women do . I hope that may ease your mind some. There are some over the counter meds you could give her if you feel she is in pain. But I would need to know a history on your dog to make sure there would not be any controindications w/ anything that I suggest. What she needs in Antibiotics and they will give her those tomorrow. If you are still online and want to chat and can answer somew of your questions post a comment back and I will be here a while. I have been in vet med for quite a long time so I am cure I can get your dog through the night and you as well.
JKB77