Adrenal Insufficency-Addisons Disease, now very sick!?

I was diagnosed with Adrenal insufficency two months ago and was put on 40mg of Cortisol daily. I was doing great until two days ago when I decided to go on a 2 mile walk with a friend, in the country. It was very hilly and quite a workout. That night I started feeling really bad. The next morning I woke up worse. I had a severe headache, muscle cramps so bad I couldn't move much, diarreha and felt very cold all day. Today has been even worse. I feel crampy (both muscles and stomach),shaky, extremley weak (to the point where I have barely moved all day), so very tired despite plenty of "resting" and sleep, and oddly disconnected from everything going on around me. I found it difficult to even have a phone conversation. My endocronologist is out of the office until monday and I don't know if my symptoms warrant an ER visit. Maybe I just overdid it? Could it be related to my Addison's? What can I try to feel better? Safe to wait till Monday?