That's fine, because I am currently operating at activity levels of about 15% or less what I did prior to injury. I think it's important to try things and go places where you may have had bad experiences. Today I went back to a store where I got completely overloaded at the check out and became very unwell a few weeks back. I completed a big shop there today, also went to two other shops and drove back home 10 miles without problems. Not the easiest thing to do, but it helps to put into perspective the progress you are making when you can achieve things where you previously failed.