IBS....

I was diagnosed with IBS about two months ago (after going through countless doctors appointments and them not listening to me telling me I was fine 🙄) anyway they gave me a prescription and it's been helping tremendously, but the last time I went to get it refilled my pharmacy messed up and I had to go without it for 4 days, I was bad again for about a week after that, and couldn't get back to normal for a while. Also, it seems to affect me more when I get my period. So, does anyone else have this that could give me any tips to help calm it down and manage it in case my medicine gets messed up again or for when I'm on my period. Thanks in advance!!