Question about IBS

Anyone is suffering from IBS (Irritable Bowel Syndrome) and it got worse during pregnancy. Did your doctor prescribe any medication that is safe during pregnancy? I am 16+2 and I wake up in the morning feeling ok but I start going for #2 not once or twice but may be 3 or 4 times and after that my stomach gets upset as if I have morning sickness. I take my nausea medication and then I am fine the rest of the day. I am just feeling sick of feeling crummy every morning.