How is it like if I have superficial phlebitis?

Condition analysis:
Phlebitis, or inflammation of a vein, is generally fairly obvious as its usually swollen and painful. Superficial differs from deep vein. The onset of one does not mean that you have the other. Whether or not its indicative of, or accompanied by a deep vein thrombus (blood clot, as in thrombophlebitis) can only be borne out by ultrasound (which you've already had).

If the pain doesn't stop and or it gets worse, then seek a second opinion. Otherwise, continue to do what your doctor instructed (probably elevation, antibiotics, anti-inflammatory, and warm compresses).

Instructions:
Ginger: Ginger has many great medicinal properties, including being a great anti-inflammatory. You can start adding more ginger to your meals to try to keep your veins less inflamed. You can also drink ginger tea, or other drinks and foods with ginger in them to help as well.