Yes, but it's a to-do and it will only find old topics that were made by you, not all posts.
First off, you can't be inside a topic to do this. Go to the first page on the Crohn's board. Next to the Post New Topic button at the top, there'll be a drop down menu. Click on the drop down menu and select 'Started By' - all the forum's topics will now be arranged in alphabetical order. The URL in the address bar will look like this.
The p=1 stands for page 1. You can swap the 1 out for any number, press Enter, and it will take you to that page provided it exists. There's currently 1192 pages on the Crohn's board, so entering a number higher than that won't work.
I took the liberty of looking up your username for you. This is the page where your topics start. www.healingwell.com/community/default.aspx?f=17&p=963&x=25&ord=s
The other way which might work is to enter your username plus any key words into HW's search bar and sift through the search results.
Dx Crohn's in summer of 2000. (Yay )
Tried and failed: 5-ASAs, azathioprine, 6MP, Remicade, methotrexate, Humira, various diets.
Had surgery Feb '13 - subtotal colectomy with end ileostomy. First thing to put me into remission in 13 years.
Had second surgery 10th July '15 to reverse the stoma and connect the ileum to the rectum. Officially flaring again. The fun never begins.