The increased heart rate is usualy caused by the tricyclics anticholinergic effect, and unfortunatly, most of the tricyclics have it. Desipramine is the mildest anticholinergic and also the least sedating (so least next day groginess)
It might be worth waiting to see if the side effects you're experiencing with desipramine settle down over the next couple of weeks as your body gets used to the drug.
The other option would be Cymbalta, this is usefull for depression, anxiety and for pain. It shouldnt have any effect on the heart at all.
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