My own experience wasn't with an SSRI, but with 5-HTP and with an herbal formula in which the main component was serotinergic.
After I had been on it for maybe two weeks I developed the world's worst ice-pick headache.
Mine was with the second dose of 5-HTP and the first of the herbal formula. Very characteristic, unmistakeable - if you didn't have your eyes open, you'd swear someone had a blunt mental instrument and was pushing with increasing and inexorable force.
I felt terrible. Agitated, jangly, sicker. Whatever shifted in my body due to the ME/CFS, my reaction to medications was definitely one of them.
Yep. But again, because I am a special little genetic snowflake, 'agitation' is a mild way of putting it. I got muscle spasms in my large muscles: glutes, legs, upper arms. Then one side of my face began to tingle... and slump. My eyebrows are back to being more or less level, now, thanks. I suppose I had a stroke.
This repeated all evening about every two hours. I dropped into sleep in between, exhausted.
Most awful medical experience of my life, which is at this point really saying something.
All I can imagine is that, because of some common ME issue, we are more likely to be agitated by SSRIs than helped by them. However, I am also homozygous recessive for MAOA, meaning I break it down even more slowly. Still, even that doesn't explain this at all. I have no idea why my body despises serotonin so much!
I have adrenal problems, last year I was actually given an appointment with an endocrinologist because my cortisol was so low. Unfortunately he didn't put me on anything good because I responded well to ACTH, even though a good response (mine was very good considering how low it was) can be indicative of problems with the body's ability to produce ACTH itself.
My ACTH is quite low, though I had a response to the ACTH stim test. The ITT test is the gold standard for determining if you have pituitary issues by measuring cortisol response to
stressors. I actually did okay with this one in terms of how I felt. If you really want to know how screwed your HPA axis really is, this is the one to do.
This happened until finally they lost patience with me and attempted what I can only describe as high pressure sales tactics, which concluded with the doctor spitefully telling me: "You will suffer for years if you don't take this".
Yeah... been there. I'm so sorry you had to go through that. It's pretty awful.
Part of me really wonders what that's all about, psychologically. (From their perspective.) Why is it so important you take an SSRI? I honestly don't understand.
-J