Indeed its possible to know everything in vedic astrology . all it takes faith , dedication ,divine bliss .
your q is very simple yet its very broad subject , we have to look for all , from house lordship to sign ,rasi placement , planets strength and weakness , and its influence on dasa lord . etc .
for you sun is 6th lord , if you know little bit of astro then dasa of 6th , 8th 12th is evil and wont do any good . only exception they should sit in another evil house .( like 6th lord in 8th vice versa ) then only it goes under name of vibareeta raja yoga , sudden unexpected fortune in life . that too after one big trauma . rest other combinations will have to undergo karma .
for you sun as 6th lord palced in 2 gives forgein settlement , eye related troubles , conflicts in family life , financial problems . not only that , sun is with venus 3rd and 8th lord, mercury 4th and 7th . so you see changes in these things , again eye trouble , forgein settlement , money problem . planets associated closely with sun get combust . for u venus and mercury is with sun . so they lost their power . but 6th lord exalted gives you undefeatable courage , powers , whatever it comes you defeat everything and overcome that . so dont worry . also another thing is you get head related problems , it may minor to major . so take care that . bear this sun dasa with courage , after that your moon dasa is very good , he is yoga karaga for your lagna , success comes from all front . life is mixed of ups and down , so accept it and play your role . participating is better than running away from game . so see this sun dasa testing period that god has going to give much happiness in future . ..