I was really sick for about 6 years and I've been in what I guess you could call "remission" from…

I was really sick for about 6 years and I've been in what I guess you could call "remission" from those illnesses for almost two years. However, this pregnancy is slowly bringing back old symptoms and they're more painful than ever before. I'm so worried that I'll just keep going downhill and not be able to take care of my little one when he or she arrives.. Has anyone else battled chronic illnesses while pregnant? How do you manage your symptoms?