I was diagnosed with a recurrence of the cancer I had 8 years ago last May. At the time I had a strange symptom that when I lay on my right side I would feel a strange sensation in my chest, kind of like the feeling you get on a roller coaster. After 2 rounds of chemo this symptom went away, and my MRI showed that the tumor had shrunk from 38mm to 4mm. I have had 4 more rounds of chemo, surgery and radiation since then and my last MRI showed no more tumor. But this strange symptom is back, and I'd like to find out what's causing it. Anyone know what can cause an adrenalin like feeling in your chest? I initially thought panic attack, but I can turn it on and off whenever I want - roll onto my side, it's there. roll onto my back it's gone. Any ideas on what could be causing this?