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.
https://www.healingwell.com/community/default.aspx?f=17&p=1&x=25&ord=s
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=sThe 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.