Here is a site with a message board, an online store, a mailing list, and even more.
Browse the home page for a variety of interesting reading, such as 'Sick Humor,' hobby suggestions including instructions, and product reviews. There are essays reminiscent of a blog and poetry including one about Medicare's Plan D.
The forum index includes a list of topics about the forum, topics common to invisible diseases, and a long list of forums for specific diseases. Multiple Sclerosis is one. You must register before participating, you must register. Don't worry if you don't know the lingo, a helpful list of abbreviations is provided.
Give it a try and enjoy.