sensation in head

For the past few years I have been suffering from a sensation in the head (left side) that comes up every time I spend a few hours working on the computer with full concentration. Earlier I thought it was a simple eye strain, but the complication is that with the sensation in the head I get respiratory problem, sneezing, bloating in the stomach, indigestion, less urine, etc. almost 15years back I had the habit of eating excessive ice cream, late in the night after office hours. Later realized that I had developed milk and sugar intolerance and blood pressure - both came under control with acetic acid and sepia. But there was a phase when for a few years Doctors put me on antibiotics and steroids and my sense is that the malfunction in the head started after excessive dependence on antibiotics (without any bacterial infection). Funny part is that when I am not working and have adequate rest during the weekends, my condition becomes normal. It comes back only when I spend a few hours on the computer. Please help in adentifying what the problem is as blood tests are not throwing up anything, and chest xrays are normal.