See your ENT. "doc, i got sinus" can and does mean a variety of different things to different people. It could be a physically blocked off nose, helped by surgery. It could be allergies, best treated by medications and/or allergy shots. It could be chronic sinusitis, treated with different medications and antibiotics. Your local md will be able to figure out what you need to feel better.
Many things! There are many options when caring for a patient with sinus trouble. Nasal saline rinses or sprays can be very helpful as they irrigate or clear out any irritating factors. Occasionally medicated nasal sprays can decrease swelling and decrease mucous production in the nasal passage. The medications require a prescription and common options include nasonex, (mometasone) flonase, etc.