Addressing the environmental factors is important, but more importantly, we need to address the diet & add more livings foods and micronutrients.
Increase your intake of Vitamin A, C and E but especially vitamin A and C.
Add more fruit & veg and salad including Beetroot.
Leave refined carbs such as white bread, white rice, white pasta etc. And avoid starchy foods such as potatoes, especially at night.
Evening meal should not be eaten late at night or be too heavy. Try having a bowl of chicken soup (cooked for a few hours) with carrots, ginger, garlic and lemon.
I would advise you to supplement your diet with some blue-green algae, purchased from here: bluegreenplanet.co.uk
Start with a tip of a tsp mixed in warm water for a week and build up to 1 tsp. It is really excellent for symptoms such as the ones mentioned. Feel free to research about it.
Most importantly, remember to eat simple, & moderately at all times as advised by the Prophet . This is a very important principle for good health, physical as well as spiritual. May Allaah subhana wa ta'ala give you shifaa.