Im an addict myself, try Neurocore...More Beta Alanine for the tingle factor! I LOVE Jack3D and had to get off as well, but wanna get back soon! Neurocore works great and i have tried my fair share of pre workout supps
Try "vpx shotgun" its the exact same thing as jack3d only shotgun has protein in it as well . I've tried both and prefer shotgun because the taste is better and you get protein with every scoop!
N2KTS is the upgrade of Jack3d, Powerchews PWO is for on the go but if you are looking for a different stim feel try Lit-up, or Juggernaut or even NO Shotgun