Anxeity, Depression and Chronic IBD sometimes get all jumbled together and the thought that you had just a bug went through my head too. With any IBD it is normal to think you are perhaps having an attack which would kick in your anxiety.
My hubby has Crohn's and if he gets a bug I always become more anxious just in case it may be his Crohn's.
I am glad you are feeling less anxious and hope you keep on talking with us as we are here to help.
Hugs to you,