I actually just had a spinal tap last week. 2 days later, came down with a nasty sinus infection & was put on antibiotics. I felt pressure from the sinus infection, but the LP headache is definitely different. It felt very intense when I was upright too long, then almost immediately went away when I laid down. It took me almost a week for the LP headache to subside & allow me to tolerate sitting & standing for any length of time. The nurse at my neuro's office said sometimes it takes a while, especially for smaller females, and everyone is different. She also said all the coughing & nose blowing may have prolonged the healing. Anyway, from what you're describing, I would say you're having more sinus pain. Good luck!
A spinal headache feels like really intense when you stand up. For me I got sick upon rising and had to lie back down. It was really intense. I have migraines which make me vomit for days and the LP headache was noticeably different and worse. Sinus headache would be like a normal sinus headache with pressure.