Sorry to hear you aren't well.
With regard to oral decongestants you need to be careful if you are on medication for high blood pressure.
I suffer from sinus and went to the chemist to get some sudafed a while ago, the pharmacist asked if I was taking any other medication and when I mentioned I was on medication for high BP he said I couldn't have any because they don't mix well with the tablets I am on for my high BP.
Olbas Oil is good for helping when your nose is bunged up, you can get it in a dropper bottle or in an inhaler. Also if you get menthol crystals and put a few in a bowl of hot water and inhale the fumes it helps to unblock your nose.