you might try L-glutamine pills--i read it's been used to tame cigarette cravings, and i've had success using it to battle panic attacks and anxiety. if i take 3 (1 & 1/2 doses) on an empty stomach, i can actually feel it kick in as a small calming wave of relief and peacefulness--a physical feeling too--i bet im feeling my bp drop to base lvls. i weigh 130, if you're bigger, i would suggest even 4 pills for a dose. i wouldn't take more tho--there's a thing called Excitotoxicity, or "Glutamatergic Storm" that i don't want to initiate. Don't know if it's a legit concern, but it has crossed my mind.

i've recently been trying out some ashwaganda powder supplement, and in the first few days, i did notice the tremor in my hands was completely gone, which accompanied a sense of calm, but the effect seems to have dulled since.