Assalam O Alaikum,
Wrong diet, lack of fiber & water, emotional stress or work stress, etc. has gifted you dryness.
First of all, take Hijamah on your back & head and toxins will be drained out.
Then, start a well balanced diet & nothing else can be better than the blessed Tibb-e-Nabawi foods & drinks (see a sample diet chart attached).
Avoid tea, coffee, BBQ & dried foods.
BUTTER will be so good for you as it is wet in nature, but if you suffer with cholesterol problems, OLIVE OIL is the only valid solution.