About 15 months ago I moved my outhouse stand to its current location. When I moved it I made a new base for it to sit on from new treated lumber. Last fall when I hunted it I seemed to get half sick every time. The only other thing I changed during this move was I put 4 landscaping blocks inside my stand to raise the level of my stool. I assumed last season that the new treated lumber may be bothering me, but last night I had the same issue, sick feeling almost to the point of throwing up. The stand has a large shooting window and three 4" porthole windows, all uncovered, 2 on one side and one on the other. Plenty of ventilation, but something is making me ill in this stand. I'd think after 15 months any effects from the treated lumber would be gone. Any ideas?