What you have looks very much like rosacea. I don't know anything about seb derm so I can't comment. What I do know is that getting a diagnosis from a dermatologist will determine your treatment options.
I am a little concerned that in your frustration you may opt to try to solve this problem yourself and make matters worse. Once you have a diagnosis, then you can look at your options. Without that you are going to get many conflicting messages. Obviously what one might do for seb derm may be the worst thing for rosacea and vice versa.