I believe the Welbutrin should help with the cig cravings, I'm pretty sure it's the one that helps with it, although it might be that it makes cigs taste gross, so you don't want them anymore. Congrats on that decision, btw. Welbutrin is a good drug, but do watch out for initial hazardous side effects, when going on/off or changing this type of drug your emotions can be thrown off until your body adjusts, which can cause suicidality. But as long as you're aware of that you can keep yourself safe and accountable.
The Ambien is likely making you feel doped - it's also prescribed for sleep. If you're not taking it at night, try asking your doctor about switching it to then. Also, smoking is a stimulant, so without that stimulant you may be feeling less stimulated than what you're used to.
Lithobid/Eskalith/Lithium? Seroquel (another sleepy one)? Abilify?