Are you experiencing congestion and stuffiness, with nasal drainage?
Is this headache, pressure-like pain?
Do you feel pressure around the eyes, cheeks and forehead, too?
Does this headache get worse with head movements, especially bending?

i know i had congestion in my head cause my ears would pop all the time, which usually happens when i have backed up snot. i dont have a runny nose, i did but it went away. the pain is like pressure, like someones squeezing the back of my head. the front of my face felt pressure too but a few days before i started getting these headaches. also these headaches went away after i stopped talking my allergy medicine. o.o so i guess thats what caused it?

and yes the pain got worse with movement or when i was in a bright area.

This sounds like sinusitis headache.
Allergies are one of the most frequent cause for chronic sinusitis (the symptoms of sinusitis occur frequently or for long periods of time), and headaches associated with sinusitis.

The pain started a week ago just after I lay down to go to sleep. The pain began on the back left of my head, at the base of my skull, behind my left ear.
My ear also hurt the first four days. My head feels like it is going to explode if I cough or bend over.
At first the pain comes and goes but I am taking about 975mg of acetaminophen and 800 mg of Ibuprofen, but today it has not gone away since I got up. I have had no injures to my head. The pain is severe and it hurts more when I turn my head to the left or the right.
There is a spot where the pain began that really hurts to the touch.

I have been sick for about 4 weeks. It started out as an allergy ; itchy throat, sneezing, nasal drainage but then it progressed . I was diagnosed with Bronchitis on on Dec 26. I was prescribed doxycycline as an antibiotic along with some cough medicine pills in gel form called “pearls”. (I don't have the meds with me here at work) My cough is under control. No fever, no sore throat. I thought at first that maybe I was a little sore from coughing so much over the last 3 weeks. But the head ache has gotten worse.
The head pain really began on Dec 24. My vision has been slightly blurry, my balance is off and my muscles have that "I need to stretch" feeling. I also have a sharp pain in my stomach that comes and goes. Goodness I sound like I am falling apart! I am going back to the doctor again today but I would like to know what you think.
No diagnosis of diabetes or arthritis.

Thanks

some times it can happen when you were younger you might of got hurt and the psycological stress of you being ill might of bought the pain on. i used to get pain in my arm were i have had injections after a few years.