I'm so sorry your feeling bad. I remember when I was first diagnosed I thought my world was coming to an end. I had two boys who needed their mom. The depression was so great to just took over even when I really tried to fight it. Then one day someone said to me "snap out of it, noone knows when they will fall ill or die. So you have to live life like each day is you last. You can't give up for your boys sake, do you want them to remember you like this or as a fighter." Well that did it, I got off my butt and started the fight. I'm not saying it isn't easy but I do beleive you need to go day by day.
Who said you couldn't go to Vegas. My family goes each year for a fun family reunion and I go and do what I can do. The lights and the sounds seem to energize me. Keep living your life and don't let Lupus stop you. Think positive, take your meds and go have fun.
I live out side Redding CA a very hot place. Last weekend it was 117* Not every hot day is going to give you a flare. Otherwise I'd be in a constant one all summer long.
Your young you have a very long life ahead of you and you need to start living it.