Why don't you try green tea. Slows metabolism. Chamomile tea is good for sleeplessness. Elderflower tea is good for common cold. Lemon balm helps when you are stressed. Ginger tea is for nausea. Peppermint is best for bloat. These are few thinks I know
Peppermint? Peppermint is a manufactured substance extracted from Water Mint.Usually sold as a cordial.I suppose you could add hot water to some of the cordial, but would that be a tea? You cannot buy Peppermint as a leaf!
Anise-Hyssop which is believed to aid in digestion, Chamomile which aids for the nerves, Lemon balm which also aids when one is stressed, and Rosemary which is good for alertness and is said to better one's memory.
Catnip is good for warm or hot drinking. Sassafras tea is also very good with a little honey. Yellow root tea is bitter but good for mouth sores and stomach problems. Wild black berry and raspberry leaves with a little honey is very refreshing. For a cough try mullin cherry bark black pine needle and honey. It is very soothing and tastes great. Spice wood tea with lemon, also dog wood berries and wild rose hips a power punch of vitamin c. I could go on and on.