The day before yesterday when skiing I had a collision with another skier. We just happened to collide at a point I thought I was avoiding him and he must have continued across the the slope and came in on myside. Anyway I had a yard sale with skies and poles going everywhere and I let myself fall as easily as I could. My helmet kept me from having a bad head impact but It did feel like impact. That night I had a slight head ache and it became worse the next morning but I attributed it to dehydration and some alcohol effect due to having had a martinini and wine at dinner. Yesturday I seemed to be ok but when going to bed last night I saw flashes or brief circles of bright light to the right of my right eye. this disappeared when I closed my eyes and I did sleep well. this morning the flashes continued but not as great as last night and I do have swelling above and below the right eye and a small amount above the left. Maybe a slight feeling of pressure behind. Not sure. So what do I have to worry about?