I am not trying to scare you- but I wound up in the hospital with this.
The organism that takes over in your gut is called C-diff
It can get really serious -especially if you get dehydrated.
Keep eating the yougurt!! If it does not get better in a day or two call back.
If you get dizzy and start vomiting uncontrolably go to the ER.
Are you still taking the antibiotic?
I was sick for about two weeks-but I had a severe case.
Here is an article on it -for kids but basically the same info:
Pseudomembranous colitis
Pseudomembranous colitis is caused by Clostridium difficile, bacteria that usually live harmlessly in the intestines of about 50% to 70% of newborns, 20% to 50% of infants, and 3% of adults. In normal daily life, C. difficile compete with other intestinal bacteria for a place in the intestines' balanced environment. But when someone takes antibiotics that kill the competing neighbor bacteria, C. difficile can grow out of control and produce two toxins that cause intestinal illness.
Signs and Symptoms
Pseudomembranous colitis happens when the antibiotics used to treat childhood illnesses also kill "friendly" bacteria that normally live in the intestines. This allows Clostridium bacteria to grow in the intestines without competition, causing a wide range of symptoms. Symptoms usually begin after a child has been taking antibiotics for 4 to 8 days, but may even start after the antibiotic treatment is finished. In mild cases of pseudomembranous colitis, a child has abdominal cramps with a little watery-brown diarrhea that is not bloody. In severe cases, a child can have bloody diarrhea, fever, and a swollen or enlarged abdomen that is tender to the touch.
Prevention
You may be able to help prevent severe pseudomembranous colitis by calling your doctor immediately if your child develops diarrhea while taking antibiotics. In general, antibiotics should be used only when there is reason to believe that an infection is caused by bacteria.
Incubation
Symptoms of pseudomembranous colitis usually begin after a child has been taking antibiotics for 4 to 8 days, but they may start as late as 5 to 21 days after a child has finished taking antibiotics.
Duration
First, the antibiotic that caused the pseudomembranous colitis must be stopped. Once this is done, symptoms of mild pseudomembranous colitis often improve within 2 days and are usually gone within 7 to 10 days. However, severe cases of pseudomembranous colitis may need to be treated with certain specific antibiotics that kill C. difficile.
Contagiousness
Pseudomembranous colitis is usually not contagious from person to person among healthy children. However, it can spread among persons who are already hospitalized for other illnesses. Hospitals usually try to isolate patients with this illness and use disinfectants and gloves when caring for them.
Home Treatment
If your doctor suspects that your child has pseudomembranous colitis, he or she will probably tell you to stop giving your child the antibiotics that caused the illness. A severely ill child will be treated in a hospital. If a child is only mildly ill, he will need to rest in bed at home. Your doctor may modify your child's diet until diarrhea passes. This may mean switching your child to a liquid diet, then a soft diet, then a regular diet over a period of days as your child's diarrhea improves.
Professional Treatment
Doctors can make the diagnosis of pseudomembranous colitis by obtaining stool samples from the child. These samples will be checked in a laboratory to see if they contain bacterial toxins. Your doctor may also need to examine the inside of your child's intestines using a colonoscope.
When to Call Your Child's Doctor
Call your doctor immediately if your child develops bloody diarrhea, or has any blood at all in his stool. Also, call your doctor if your child has been taking antibiotics and suddenly develops cramps and diarrhea.
). As the day progresses, things are normalizing a bit with how it all looks, but I am having low-level cramping and some queasiness that had not been there yesterday. 
