Tea: Never drink green tea. It is best to drink black tea and Pu 'er tea.
Gastrointestinal discomfort: you can eat Chinese patent medicines that strengthen the spleen and stomach for a while, such as Xiangshawei Pills.
Body dampness: pay attention to dampness. You can eat red bean porridge, barley porridge and so on. And you can also eat some Chinese patent medicines for invigorating the spleen and drying dampness (I can't remember the name of the medicine, you can ask the pharmacy).
Cold accumulation: usually pay attention to wear more clothes, don't catch cold by blowing, especially on the stomach and back, and eat more mutton soup or instant-boiled mutton in winter.