Ayurveda’s approach is quite interesting as it aims at addressing the root cause of your symptoms rather than just suppressing them. Sounds like you might be dealing with a mix of Vata and Kapha imbalance. With the dry and night-time phlegmy cough, the irritated throat: it suggests Vata is causing dryness, while Kapha could be the reason for that morning chest heaviness.
Let’s start with those herbs you mentioned - Tulsi (also known as Holy Basil), Mulethi (Licorice), and Vasa (Adhatoda Vasica) are great choices. Tulsi can soothe your throat and act as an anti-inflammatory, while Mulethi helps with throat irritation and is pretty good for that dry cough. Vasa can help in managing phlegm, breaking it up. You could make a decoction by boiling these herbs together; a teaspoon each in about two cups of water until it reduces to one cup. Strain and drink warm, twice a day. Adds a touch of honey (natural expectorant) when it’s lukewarm, never hot! Just, be moderate with Mulethi if you have high blood pressure.
Steaming sounds like a smart move, really. Use eucalyptus oil or camphor, as they can clear up the congestion without over-drying your airways. Simply add a few drops to hot water and inhale the steam. Do it in the evening for about 10 minutes but don’t overdo it, once daily should be enuf.
About your diet, yeah, try cutting back on spicy and fried stuff, as they can increase Pitta and irritate your throat more. Focus on warming, cooked foods that are easier on your digestion. Warm soups, broths, and herbal teas can soothe your throat quite a bit. Drink warm water throughout the day, maybe with a slice of ginger to pacify Vata. Include turmeric in your meals too, for its anti-inflammatory properties.
For sleep, a nice bedtime routine could help. Consider gargling with warm salt water before bed, twice a day, you can also try Triphala (an ayurvedic herb combo known for its balancing properties) in hot water with a pinch of honey to enhance immunity. And a cup of warm milk with a pinch of turmeric might just help you relax and ease the coughy nights.
Of course, consistency is key. If symptoms get worse or persist, it’s important to get checked by a healthcare professional. Ayurveda works best as part of a holistic approach, incorporating long-term lifestyle changes. So, give it a go, see how your body responds, and tweak it as necessary.