Lightheaded, headaches; sinus pressure. ears feel blocked and sometimes ache. nasal congestion like the airways are narrowing for 2 months. sinusitis?

Good guess: I agree with you. You should quit smoking NOW otherwise improving your sinusitis will be VERY DIFFICULT. You should be under the care of your primary care and/or ENT physician. If you continue to smoke you are letting your self in for a very uncomfortable future with worse headaches and running into possible ear nose & throat cancer.