That's a tough question to answer -- it depends on what kinds of stores you have in your area. Unfortunately, as Whole Foods has come to dominate the market, other stores have mostly become little Whole Foods. If you can find a really good smaller independent health food store, ask them what they think the best is. The ones I used to sell when i managed health food stores are just not available easily anymore, because Whole Foods and its copy cats don't carry them. You just have to do the best you can with what's there, but even at Whole Foods you might not find the best but you will find ones that will help.
Thank you ill try that! Any good brands you know of for probiotics?
Some people do feel this from antibiotics. Go to your nearest best health food store and buy a multi-spectrum probiotic from the refrigerated section of the supplements department. This might help, but should be taken regardless to replenish the beneficial organisms the antibiotic killed off.