Hi, I went surfing on Tuesday afternoon(five days ago). During the session a wave broke on my face and water forcefully went into my nose. Immediately after, there were no problems. However, when I woke on Wednesday morning I had a great deal of mucus and post nasal drip. The mucus was dark green and part of it was bloody. Since then, I have continued to have green mucus, runny nose, and post nasal drip. What can I do to ease the symptoms? Should I be concerned about being contagious?