Dont know how but iv just been owned at .25/.5 HELP!

[ImpulseKid]

I usually play 6max at higher stakes but i decided to play some 0.25/0.50 HU and see how i do.

The session all started well and i was up to $130 against villain (who was terrible, calling pot size bets on both pot and turn with gutshots and btm pair etc). He called litterally 100% of the time in the bb and usually called on the button rather than raising.

He then changed and became very aggro, raising almost all of his buttons and betting the flop and often the turn if called. He also was not calling quite as frequently in the bb. Another point is that he called 90% of my cbets on the flop.

Now how should i be adapting my game to counter his play at both the start and end of the session (ie. fishy/passive/call station and then very aggro LAG) ?