Ok I can't tell you anything about weight loss. But for skin... i can tell you this.. they have amazing facials in Pakistan at good salons. Results are amazing. Even when you are tired and exhausted from all the shopping, you'll be surprised to see the results after the facials. They have all kinds from glow facials to herbal .. etc..
My wedding was in May too. Its exteremely hot there. Get facials on regular basis. It does wonders. That should also take care of black heads/white heads.
As far as hair goes. I have extremely thick curly hair. I used straightner too. Of course the humidity over there is way too much which makes hair frizzy. Just straighten your hair well and apply some kind of anti-frizz serum. You'll have to probably wash your hair everyday or every other day.