Hello. I've Been Experiencing Facial And Head Pressures Which Can

Hello. I've been experiencing facial and head pressures which can sometimes be painful. It's been on going for over 3 weeks now. I've seen the doctors 3 times within the last 3 weeks. They think it's sinusitis due to allergies. It is that time of year. But I've never experienced this condition before. I've been prescribed loratadine and amoxicillin for 10 days. I do have some drainage which appears to be white and loose. No coughs or fevers. Could it be I have a sinus infection? How long until it will get better? Help.. 33 yr old male