What Causes Congestion In Throat And Nasal Blockage Every Morning?

Constant congestionI ve had congestion problems for about the last 5 years. To start with I assumed it was just sinus problems and that I d have to put up with it. But it does affect my day-to-day life. Symptoms are: 1. I get very congested in the mornings from about 30 minutes after getting up for the next 2 hourse, and evenings from about 7:30pm onwards - I cough or clear my throat constantly (which is embarrassing when its all the time, especially at work or socially) 2. Overnight my nose gets blocked and I often wake up with one or both nostrils blocked which is uncomfortable 3. Every so often (on average about every 1.5 weeks) I get sinus pain and headaches. I control this using Sudafed which seems to work but I take it a lot (probably a pack of 24 every month). 4. I have to blow my nose a lot during the day, not as bad as when you have a cold but still much more than I used to By the way I should say that I m not an asthma or hay fever sufferer and I ve never had allergies (as far as I know). I have not consulted my GP or anyone else about this because it seemed not too serious and something that I assumed there is no treatment for and I would just have to live with. But after 5 years it s only got worse rather than better and it s so constant it gets me down. Any advice for me?