Yes, yes and yes. Antibitiotics can cause IBS - have you tried a good probiotic drink/tablets to help the good bacteria in your gut?
LIVE yoghurt can help too. I buy the Greek plain variety with "LIVE" in red print on the tub. Not 'natural' but 'live'

a table spoonful 3 times a day is good for us anyway and I used it when ever I had a 'thrush' infection (eaten and applied

)
IBS can become problematic as hormone levels alter. I always had 'the runs' within an hour before a period started even if a bleed wasn't due!