Since you have had SD for a while it will take a bit longer for you to recover.  Eczema and asthma are related and IBS well your not the only one.  I mentioned in my posts the importance of cleansing or detoxification.  I would be careful with the asthma part…take it slow.  As you clean your body you will experience greater symptoms.
Everyone does some worse than others.   Remmember to focus on the cause not the symptoms.

For supervision I used a natural holistic type md actually a chiropracter, general MD practiotioner (integrative medicine) and nutritionist to guide me.  You just need one…I had many problems besides SD.  The MD was good for a few blood tests etc. Seeing another mainstream doc is a waste(disease management).  You’ll never get to the root of the problem.

Your body might not be able to support the vitamins.  I would not give up.  If you need a product recommendation let me know.

Shampoos. Natural only with ingredients like tea tree oil, selenium, or neem oil.

I sent you articles.  Let me know your thoughts.  You call the shots. I’m not a doctor.
I’m just educating you not medicating you.

Welcome to the board.  Seems as though stress and poor diet triggered your SD.  Me too years ago when I was in college.  Common pattern in most.  So you changed your diet and things looked good from there, switching from processed chemical based foods to nutritious whole foods that actually heal the body.  Fish oil - good choice.
So if this makes sense then why would you continue to use chemicals on your face or scalp?  Chemicals are toxic your body knows this.  Steroids or non steroid creams suppress the immune system…not very good.  Your body will  never heal.  The medical system is about  disease management and sympton suppression. Your body is sick so heal it..  I used at least 15 different creams over the years that did nothing.   Elidel worked well till I think it gave me Rosacea(not confirmed) and then I found out about the long term cancer warnings on it so I  stopped cold.  Went natural and now I’m in complete remission and  drug free.  Review some of my pervious posts and I will email you some articles. 

R

Here’s a good explanation of what’s happening:

This is evidence that the hydrocortisone is not addressing the cause; it simply suppressing the symptoms. I cannot express to you how dangerous this is. You really need to address the cause of the irritation in order to receive true healing. Your skin is manifesting those symptoms to warn you of the dangers taking place within your body. Silencing the symptoms gives a false sense of security. It is like taking the battery out of a smoke alarm so that you no longer hear the annoying beep. The purpose of the smoke alarm’s high pitch ring is to alert of impending danger and to save life. Silencing that warning signal is dangerous. This is the same thing that you are doing with the hydrocortisone; you’re shutting off the body’s warning signal. Your body is warning you of the high toxicity that exists within it. The inflammation, redness, etc. is evidence of the fight existing between your immune system and those toxic invaders. Hydrocortisone (steroids) suppress the immune system and impedes their ability to fight and defend against those toxic invaders. Hydrocortisone is an anti-histamine. A natural anti-histamine is vitamin C; thus, you can achieve that type of relief naturally without the harmful side effects of your cortisone treatments.

Nonetheless, the most important thing that you need to address is the identification of the toxic allergen/irritant that is promoting your distress. When you get rid of the thing that is promoting your distress than the body can truly heal. Hydrocortisone is not addressing the cause; its simply suppressing your body’s warning signal to alert of the danger happening within the body. In addition, and because the body sees the medication as an additional foreign allergen/irritant it is causing further damage to the immune system and promoting the longterm suffering.