You might want to keep your Pristiq doseage low through the worst of this. Alot of the anxiety, sweating, flushing, rls and insomnia come from massive release of norepinephrine - and Pristiq will increase the amount available - will somewhat oppose a WD med like clonidine.
Stuff you can use...thats easy to get from any GP, PA, NP ect
Zanaflex - like clonidine - less fatigue & low BP, need 4-12mg 3x day
Neurontin - up to 3.6g 3-4x day for severe wd
Baclofen - 40-60mg helps quite a bit for the psychological aspects
I've cold turkeyed 3 months of 24mg / transbuccal fent in jail...brutal but its over suprisingly quickly, much faster than a 5\bag day heroin habit. The achyiness and fatigue stuck with me for like 2 months though