Finding the problem

I thought for many years I had IBS (diarreah/constipation). I had this for over 10 years. Finally a year ago I found out I was lactose intolerant. The diarreah went away. Last year I found out I have an underactive thyroid. I am now on medicine to fix the thyroid problem (at 7 weeks right now). The constipation has gone away. If you haven't checked into this, please do. An overactive thyroid causes diarreah, and underactive thyroid causes constipation.