The pathology of what is causing the rosacea has alot to do with heat and stress.
Stress is creating heat and being in a hot environment is exacerbating this heat. It would appear that alot of this heat has existed in your body for a long time.
Can you get a Bupleurum supplement where you live? If so, I suggest you try that for a while to assist in clearing the heat and stress, and select a diet which is easy on the stomach but also promotes digestion.
Include green apples and lemon juice daily to soothe the liver, and avoid chilli and extreme spices other than cumin and fennel (to aid digestion).
Black coffee without milk is good to purge the liver in the mornings, but only one cup brewed from fresh beans (not instant). There is a herb called Ophiopogon which is worth looking into, as this can help rebuild the stomach fluids that are lacking - when they are lacking the stomach becomes dry and burns the lungs which control the skin. My guess is you probably have red in the whites of your eyes on either side of the Iris' as well.
If sleep is an issue, Asparagus root can also contribute to nourishing the lungs and hence the skin and herbs like skullcap (which HP Shannon suggested) can aid you in purging the liver, along with the coffee and bupleurum. Avoid strong energetics like ginseng, ginko, horny goat weed and anything else you are taking along these lines and if you can increase your exercise this will help to prevent the liver qi overacting on your stomach in the future.
If you still have problems with hyperacidity and you are not allergic to shellfish, buy some oysters, eat them and then clean and bake the shells dry (to kill any resident algaes) and then crush the shells and take half a tablespoon in honey before bed or at any time you experience hyperacidity. This is like a natural quick-eze minus the aluminum and add zinc in abundance which is also good for skin healing. If you wanted to take a herbal formula, I would recommend Sha Shen Mai Men Dong Tong with Xiao Yao Wan together for a month and see if there is any improvement. Chronic stomach issues can be difficult (I know as I have experienced them myself) and can also be due to a debilitated sun. Working on the sun in your chart may give you the willpower you need to pursue the lines of inquiry I have left for you here and follow through to obtain some of these difficult to get items, thus bringing healing spiritually, mentally and physically.