Oh My Gosh; You've suffered a serious allergic reaction to the sun. I am so sorry that you are going through all of this. We must avoid the sun as much as possible (as well as fluorescent lighting) because our disease causes us to have just the type or reactions that you are suffering from now.
Do you have any medical coverage? Are you taking any prescribed medications for your lupus?
I ask these questions because there are some medications that can help to speed up the healing process from this flare. Also, some of your current medications may be increased for a period of time to get you through this flare. In any case, I think that you should try to see a doctor to get some help for all of these symptoms that you are suffering from.
The exacerbated fatigue is also a symptom of the sun exposure and the flare up. There is not much that you can do about the fatigue without treating the underlying cause.
I do hope that you feel better very soon...wishing you the best.
Peace and Blessings