Hello and welcome!
Everyone is giving great suggestions - my fear is that all of it is helpful, which may mean none of it is helpful

By that I mean that everyone is different - unfortunately, there's usually no clear choice, and finding what works for YOU may take a while.
My Sjs is secondary to Lupus - I also have APS and Raynauds, and probably some other stuff too. I was pretty sick a few years ago, but now I live a relatively "normal", active life and make what I'd generally say are only small concessions to my wacky immune system. Some of them were hard to adjust to, and I struggle sometimes - but I do consider myself very lucky to have the health that I do - and with these meds, diet, etc I have seen a LOT of improvement in my quality of life.
For me, what works best is:
- Making sure I get plenty of good-quality sleep (bought a very good mattress, insist on going to bed early and getting extra sleep if I am feeling low, observing good "sleep hygiene"- look that one up on the internet if you are not familiar with the idea)
- Eating a healthy diet with little or no gluten, no processed foods, no artificial sweeteners, very little dairy, and very few grains/starches. (I do "cheat" on this when traveling or on special occasions, but try to stick to it 99% of the time...if I don't I definitely feel it in body aches, brain fog, and fatigue!)
- Exercising. Ugh - I hate this one, but it's true - it's very important to stay as fit as you can - it helps EVERYTHING. I have a very active job, but I also try to get in lots of walking with my dog, gardening, hiking, etc. I hate gyms so I try to do stuff outside instead.
- Supplements - I take turmeric, fish oil, vitamin D, magnesium, a very low dose of DHEA, a good multivitamin, B-complex, CoQ-10, and some other stuff i am forgetting right now, LOL - but that's the important stuff.
- I take 400mg Plaquenil daily and feel that it has helped quite a bit with fatigue and also mouth dryness.
- I take varying amounts of Methotrexate each week, usually in two doses (Monday night and Thursday night). I have been taking it long enough that my doctor lets me decide how much I need, and I take as little as possible - I kinda let my body tell me what kind of shape it's in. It helps me a lot, and when I go off of it for a while (as you do sometimes when fighting off a virus, etc) I definitely feel it. When I first started, I was very afraid of it and I had to adjust, but now I have almost no side effects. It doesn't work well for everyone, but it has helped me a LOT with fatigue, body aches, and brain fog, as well as general energy level. I also sleep like a LOG on the nights I take it! (That's a GOOD side effect

)
- I do take a very small dose of Prednisone daily - again, my doc lets me decide how much I need, but generally it's between 2 and 5mg, which is technically a "biologic dose" and should not have any side effects. It seems weird to me that such a tiny dose of ANYTHING could matter, but it does....those few molecules of steroid make a pretty big difference in my quality of life, so I take them. I always try to take as little as possible.
It has taken several years of trial-and-error to find this balance, and it's a constant process of monitoring and adjusting. There are periods of feeling great, and also flares, where I don't feel so great - but generally it's pretty good, and it's SO MUCH BETTER that it was before I was diagnosed!!!!!! I know things will probably change, too....that's just the nature of this stuff.
But for right now this is working well for me. I hope it helps! Don't be afraid to try things, just be sure to work with your doctor on it, even if it's just OTC stuff, diet, or supplements.