Thanks for checking in and the positive reinforcment.
Yeah, it's defiently true. If someone doesn't have seborrheic dermatitis it is easy for them to brush it off as nothing of concern. Only after experiencing the torment of not understanding what your skin will do next can someone appreciete how annothing of an issue it really is. Particularly when it is flaring, pussing, drying and cracking all over your face.
In terms of soidum, yeah it was something I had to readjust to myself. Maybe it's not that good, maybe it is. However, it seems to have helped in general.
Funny you should mention tomatoes. My SD was in remission for about year, but I kept researching just in case. About a month ago I started experiencing a bit of irriation again. My routine didn't change, so I was clueless as to what was happening.
However, just in time I came across this research paper and decided to examine the concept further. After learning more about the topic, I used my self as a test subject. In about of week of loading up on certain foods my SD was back practically in full effect. Then upon cutting them out issues subsided and skin healed (took about a week).
You can find the approach in detail here using the password skinnydrone to access it. Perhaps it might be of benefit to you.
All the best and hope some of the info on the site helps.