I'd pass on the True Life. It's dairy based, and most people without even knowing it have trouble with dairy even without the problems you're having. And it's shelf stable, which means the probiotics in it may well be dead before you get them into your body. These are live organisms, and they can die off if not kept refrigerated for at least most of the time from manufacture to getting to your refrigerator at home. At that temperature, they don't wake up, they hibernate, and so they don't need to eat and don't die. That's not to say all shelf-stable bacteria die, but enough might to make it ineffective. All the best ones are kept refrigerated. Not that you can actually get the best ones anymore, even most large health food stores don't carry them anymore. The main one you want for digestion is bifidus, but during and after a bout of antibiotics a high quality refrigerated multi-spectrum probiotic should be taken for awhile, as antibiotics do in fact indiscriminately kill bacteria, including the good ones. This is on top of the fact modern humans largely lack a lot of the beneficial microbes we are supposed to have to begin with. So go to the best health food store in your area and buy the best one they have and make sure bifidus is emphasized given your problems, but not confined to that as you are subject to a lot of harmful bacteria that flourish when the good guys are gone. But that doesn't mean I'm saying that's the reason for your problems, just that it might be. Other things can be going on. Antibiotics often cause a lot of bad stuff to happen after, partly because of this die-off but also because they create an imbalance in your immune system. Sometimes this can lead to resistant bacteria as well, which means whatever you had could come right back again. A lot of chronic problems can follow the use of antibiotics, which is why the official criteria has finally changed to only use them when necessary. You don't say why you were taking them in the first place, so it could just be that still being around. And it could be a host of things. I'd probably want to see my doctor and get your blood tested and all that to make sure you're not missing something you need. You could also be dehydrated because of the diarrhea. I don't know that peanut butter helps with probiotics, and it can be hard to digest. Usually when we feel like you do we go to the doc, and we eat soup or something easy on us, which can differ by the person. You do need nutrients. If you can't hold food down, you might have to find another way to do that. There are also prebiotics, which is the food probiotics thrive on. Fermented and cultured foods tend to be good for this, such as yogurt, although it is dairy, and things you aren't going to want to eat when you're sick, such as kim chi, sauerkraut, and pickles. But a fermented food you might find useful is miso, as miso soup is very soothing. Daikon radish might help, and you can sometimes find pickles made out of that. Umeboshi plums you probably won't want to eat either right now but they can help with both prebiotics and your stomach. But first, go see your doc. Peace.