I would never take an anti biotic to "cover the bases"
In fact that was the docs approach I would most likely not go back. In my opinion being on antibiotics for 2 years for acne is what caused my Crohn's.
If I have to take antibiotics I always make sure to take extra probiotic yogurt 2 hours after dosage to replace the killed gut bacteria with good bugs.
I too have had great results with Saccharomyces Boulardii, although it is a yeast not a probiotic.
Dx - Crohn's, Diverticulitis, SIBO, Carbohydrate Malabsorption, Slow Small Bowel Motility
Diet - SCD, Low FodMap, Low Carb
Current Drugs - Pentasa (3 x 500), LDN (4.5), Amitriptyline (25),
Past Drugs - Xifaxan (Rifaximin), Prednosone, Entocort, Cipro
Supplements - Vit D and B complex, fish oil and SCD multivitamin