I have severe pain on my forehead in between my eyebrow region. This is since a week and is severe in morning and fine in evening?

Sinusitis. From your brief description it appears that your frontal sinus may be involved either with an obstruction of the normal drainage or an infection. You should contact your primary care doctor to evaluate the problem.
Forehead pain. Your description sounds like sinus pressure or a tension headache. Try using otc headache meds and decongestants if you are congested and see your doctor.