Hey Liz!
We have a great, active Carb Counters forum - you may want to check it out! Also, we have the 40-somethings support group...you might enjoy posting there.
You also could check out the 100 lb club, a group for those losing or who have lost around 100 lbs or more. It is a great, active, supportive group, full of advice.
As far as losing with medical/prescription obstacles, you might also see our "Dieting with Obstacles" forum.
As you can tell, there are a ton of spots for you to explore and find others in similar situations, so look around, settle in, and keep going. Can't wait to get to know you better!