On Cymbalta , Just Sttarted Xanax Xr

hey guys.. been battling anxiety, and some depression, with anxiety being the main issue for some years.. well for the past 6 or so months i have been on cymbalta which is.. ehh.. satisfactory... anxiety decreased some over the last 3-5 months and i was fine.. the past 3-4 weeks, my anxiety has progressively increasing to the point where its horrible.. (i feel it might be problems in my relationship as well as my new, more stressful job).. anyway, i saw him a couple of nights ago and told him that my anxiety ahs been getting worse and worse and im having full blown panic attacks at times and cant live like this.. im on cymbalta 60mg... he wrote me out a script for 30 1mg xanax XR's for the next month with one refill. few questions.. i was on xanax 1mg regular release ones last year when i was on effexor (a different doc) and they were for the sporadic times that i had higher anxiety, not just everyday usage.. i just liked it because it wasnt something i needed to take every morning, just the type of thing where i would take a couple times a week if i had the monster crawling up my back. lol. well with the xanax 1mg XR, i took my first one this morning, and i still feel anxiety. its horrible still.. it feels like its breaking through whether the dosage of the XR just is too low, or it just sint the right med for me. (even tho the regular release xanax worked good on an as needed basis) now is this XR-1mg stuff released 1mg ever 2 or 3 hours until the 20-24 hours is complete?? or is it just 1mg divided by like 24 hours? cuz if thats the case, that would explain why its not helping me.. that would be like .0324545 mg per hour.. you get the idea. i dont know if i should call him this afternoon and tell him its not helping, and what i should do, or have the XR dose increased or what... please help guys, i never try to ask for specific meds from my doc, i always try to let them pick what THEY think is better for me.. but i just get so frustrated sometimes... advice? info? please help all..

p.s. also feel like the XR's lose what little power they have after about 8-10 hour mark. any feedback on that too?