GoingCrazy, I think I once experienced the sort of pressure in the brain feeling during the second week I was on an antidepressant called Effexor. It was a constant feeling that I couldn't forget about and along with it there was a significant reduction in my intelligence. Thankfully it stopped a week or two after ceasing the drug.
That's good to hear that it went away after you stopped using the anti-depressant. But my headache was constant and not caused by any medication I was using or anything, just my body itself. That's actually probably a side effect for using antidepressants, as it messes with the serotonin in your brain, it's the same mechanism that causes headaches and migraines. (I believe)