The Best Mental Concentration Technique Day-3

Today was amazing. It is now 21:19 p.m. and my brain continues to ache again like the other previous days. I tried to imagine a white background and a small red circle over it, it worked for a few seconds , and again i lost it , but tried again and again during the day. I did not close my eyes today, I had made the imagination my eyes opened.It was hard to realise the image, but i think I could do it for a few seconds but only a few seconds, not more.