Whats my best defence for driving under influence of controled substince and open container

Cop was pulled on right side of road lights on I got in passing lane and slowed down for his safety he imediatly pulled me over I had an open beer and one can aside of me he noticed me trying to push can under coat and thought i was hideing a weapon said freeze pulled me out of truck seen my open beer spill only had one half beer all day but had a sustantial amount of methametemine in me couldent walk toe to toe because i have bad ankels from construction im disabaled mental and phisical reasons shined light in eyes said pupals where dialated told them the 7 meds i was on thought that was reason got blood test and released wasent acting intoxicated asked why he pulled me over said i got too close to his car and was speeding this i swear on my soal is not true first offence but i have afelony conviction for trying to pass a fake perscription for class 2 drugs testifyed against girl who was righting the perscriptions two years probation no offences not an alcoholic or addict just wanted