I hate to be the bearer of bad news, but it sounds like you're going to have to choose between more rash and scars, or a tan. I have worked in the skin care industry for over 25 years, and I did a lot of research on the subject.
I had singles last year, and I was miserable. The rash didn't even begin to show up until about a week to ten days after my initial symptom, which was a very stiff neck, headache, and nausea, which I thought was the flu. By the time the rash showed up, I was already too far into the process of shingles for the medication to help.
Shingles is more than a rash. As a matter of fact, the rash was the least of my worries when I had it. My outbreak of shingles was along the route of the nerve that serves my right shoulder/chest/back. The entire time I had it, I had a persistent and intense ache in those areas that made it almost impossible for me to do anything. It's a reoccurance of the herpes virus that causes Chicken Pox. Once it's in your system, it can resurface at any time.
In all the research I did on shingles, I learned that sunlight (real of fake)will only make the rash worse. Sunlight can also causes permanent scarring. Heat is one of the worst things you can do for the rash. check the Mayo Clinic web site, or WebMD for more information.
I would forego the sun and tanning bed exposure, and look into using something along the lines of Sally Hansen's leg make-up to enhance the look of a tan. I've used that when I was wearing white, and it did not rub off on the garment (maybe a little bit in the inner seams, but nowhere else).
Also -- do not use self tanners when you have sores of any kind! They can collect in the sores, causing a darkening of the skin in that spot, and can result in a permanent scar. I know. With three cats at home, I've had my share of minor scratches that are now scars because I used self tanner while they were still healing.
I used coconut oil a few times a day on my rash scars, and they have diminished dramatically -- some of them have even disapeared completely.
Good luck, and treat your skin well! And, most of all -- have a great time at your brother's wedding!