I was also diagnosed with tumid lupus in october 2003. I just got back from the beach and did well, but stayed completely out of the sun and tried to avoid the heat. I have found that I am very heat sensitive. I had heat exhaustion and dehydration (which may have been heat stroke--refused to go to the doc) recently, after working in my yard in the early morning. I knew I was overdoing it due to the humidity, but it caused my entire body to go into muscle cramps as well as shaking, near-fainting, trouble breathing, etc.
I have read that tumid is more like the scle type of lupus because it can carry some side effects. I take 400mg plaquenil per day and use sunscreen lotion like crazy. Sometimes I just have to tell people that I can't do something because of the sun, heat, or my fatigue. My biggest battle has been fighting mouth sores, especially on my tongue. The sores that were biopsied and diagnosed me were across the top of my back...They never hurt, just wouldn't go away. I ocassionally get scarring sores and have more trouble healing when I have a minor skin wound.
Hope this helped a little. There's not much out there about it, my docs (other than the derm) had never heard of it.
Find a sunscreen lotion that you really like (my favorite...And i've tried a lot) is alba botanica sun shade with spf 16. It can be ordered online or bought at gnc and some spas. It's not very expensive ($10-15/bottle). It has a light odor, but not overwhelming and makes your skin very soft.
Heading back to the coast for the weekend...Would be nice to actually go to the beach with my kids for the day! My husband and I are renewing our wedding vows on saturday after a recent separation (long, long story). We'll be having them on folly beach during sunset (see, I planned around the lupus! The habits we develop).
Good luck with the docs. Hope this helped a little and let me know if you hear any other information. Feel free to pm me if you have questions or would like to chat!