List of other diseases, conditions, or injuries and their treatment: Prior 2 year Herion Smoking Addiction is my reason for being a Current Methadone Maintainence Patient 7o mg per day dose step 6 level as per 2 years of clean testing. Also, my nose has been broken since I was a child with the left nostril being the semi-collapsed side.
Have a diagnosis for the current condition: no
Current medical status: EXTREME Pain behind the left eye, Pain on the sides of my head intensifying when I lean over. On a pain scale of 1 to 10 9 when I lean over.
Current medical treatment: None, I thought it was a sinus infection so I was taking decongestant to clear my head.

Given your description of extreme pain behind the left eye and side head pain with an intensity of 9 on a scale of 0-10, it seems you might be experiencing what you suspected: acute sinusitis (inflammation of the lining of the paranasal sinuses). Specifically, head pain, intensifying when you lean over is a characteristic sign of sinusitis and it often happens after predisposition (obstruction of nasal and paranasal paths, provoked by nose trauma, etc.). However, decongestants are not enough to relieve a bacterial type of sinusitis. It is recommended to visit your family doctor, who might do a head X-ray, common blood tests and a nasal swab (if needed), to confirm or exclude possible conditions and add an antibiotic to treatment, if necessary (no penicillin and no cephalosporines). Moreover, as other possibilities: tension headaches, cluster headaches, and atypical migraines might cause pain around and behind the eyes. Optic neuritis, as well, is one thing that can cause pain, but it's very unlikely to be that if your vision is unaffected. After the physical examination done by your family doctor, if s/he suspects something of the above mentioned, you might be referred to a neurologist, who will prescribe an adequate etiological treatment (against the cause) as well as symptomatic treatment (for the pain).