I know exactly how you feel. I am in the same situation as you. I have never been able to get off steroids since I started them cause every time I get below 10 then I mess up again. I have been dealing with a flare now for the last 2 months. Went up to 20 and then tapered a half a pill every week but now that I got down to 12.5mgs my symptoms returned and back up to 20 again.
It weird but any strenous exercise messes me up. I used to walk on my treadmill for 5 miles a day. Now if I do 15 minutes a day I get pericarditis or even yard work or excessive house work. I have to pace myself a lot more slowly and not worry about how long its takes me to be able to get things done.
Along with pericarditis I sometimes get pleurisy and joint aches if I let things go to long without upping the steroids.
I was told that I might need a pericardial window but that hasnt had to happen. I dont have medical insurance so could never afford that operation so this is my only option at this time. Are you being followed by a cardiologist too? I sometimes get request from my rheumatologist to get checked by him but he says so far my heart is strong.
Well lets stay strong and never give up the fight . Keep positive as much as you can. It helps me to deal with things I cannot change. People are always telling me that I am always a calm peaceful person and that is true.