Your LO sounds exactly like mine. Like you, I said really a a year long cold!! I got sent to see a respiratory specialist. And we had already had adenoids and grommets done. So I would suggest go straight to the Chiro. Easy and cheap first step. Go see the ENT as they too can do wonders. But also see a respiratory specialist. There are some great nasal sprays that can help. Feel free to message me for more detail as you sound exactly like me. Good luck.