Welcome to the forum.
Yes, I agree - you probably were given antibiotics for the strep throat and that wipes out your gut flora and good bacteria.
I would suggest you start on a good quality probiotic right away, and if you are on an antibiotic currently, then you'll need to double the dosage at the very least. BUT do not take them together - they must be taken at least 4-5 hours apart.
Hope you feel better soon.