Just to clarify:

yes, I do feel that sensation of pressure I described in my previous entry basically all the time, and have been for at least the last five years or so. (It's not a coincidence that that's also the time when I started dropping off the net and being unable to keep in touch with friends.) Sometimes it stops for a few hours, but most of the time it's there like a vise around my chest. Occasionally - frequently - it gets worse, for a little while.