Oh, I can relate! The worst mozzie cloud I had to sleep through was on Pemba Island, the smaller island north of Unguja in Zanzibar. The air was so thick with them that like you, I was bitten all over. I had a net but the only thing that saved me from being carried away by the swarm was a fan set on "aircraft engine". Didn't sleep much that night! We're so lucky that our Joburg mozzies are properly confused by liquid electric thingy, at least at night. During the day, even the mornings, it's a free-for-all, all-you-can-suck buffet for them.