Hi, Sharon, and welcome to SparkPeople, a wonderful community of supportive participants who care for one another and their progress and concerns.
(and many more countries).
There are groups of like-minded individuals who help one another to lose weight and become more active, even with existing health conditions. How do you investigate and find a group that "feels right" for you? Well, in the SparkPeople community, these groups are called SparkTeams. From the top of most pages, select "Community", and then select SparkTeams.
I think that you would call your concerns "medical conditions". Follow this link: www.sparkpeople.com/myspark/groups_categor
Best wishes as you further your lifestyle goals! InSh8p