rashes, fatigue, joint pains, brain fogs, sensitive to sun are pretty classical symptoms of lupus. As for your facial rashes, google lupus facial rash or lupus rash image, and see if it looks anything alike. If you can see a butterfly shape rash on your face, then it's most probably a lupus rash. The time I had my facial rash, it looked like a butterfly.
I hope you can find an answer for all your symptoms soon.