Hey all. After recently being diagnosed with secondary adrenal insufficiency, I've been on Hydrocortisone at pretty high doses, with all sorts of mixed results. Im not sure how much this has to with the HC, as I was also having it at times in the months before starting it. I sometimes am going through periods of my body stiffening up. Usually its more on the left side of the body. Its like an ache in the chest and arm muscles, more concentrated on the left side. I often can feel my pulse strongly in the left side of my neck, and it gets worse until there is a pulling feeling down the left arm, left neck, and left chest muscle. It's also in the other side of the body, but much more pronounced on the left. It's a scary feeling.. really not sure what it is. I have to lay very still during this, and the more I move the stiffer i feel.. movement becomes slowed. Sometimes it even progresses to a point where my heart starts to palpitate very fast and I sweat (I've only started sweating again since starting HC, before that i've barely sweated in YEARS). Not alot relieves it, I usually take some magnesium which can help a little, or valium can settle it a bit too, but generally just have to wait the episode out. I try to keep calm but when it gets to the worst point there is almost panic type feelings coming on, i have to REALLY concentrate and try not to let that happen. Anyone else get this or have any idea what it may be?