I agree with you, Op stated her meds and while I am not a doctor/pharmacist, with the amount of Lithium in her system I am very concerned with the effects on her liver.
Lithium750mg /Seroquel 400mg/ Synthoid 25mg and now wellbutrin
Definitely be open and honest with your Dr.
When people go on and off meds and or combine them with something new it is unsafe and could result in death.
Euphoria = a bad combination or side effect and should be reported to Dr. and the manufacturer of said medication.

I am trying to quit smoking. I have tried on my own, didn't work.
Went to dr. and started the patch on 2nd try and had muscle movements.
I tried the inhaler which worked but still struggled. I started to have gum weakness and tongue felt funny. The same with those loungers, the point is I told my doctor and she hasn't given up on me. I have nerve damage and I really need to quit. Setting up group therapy or a true coach-line, if that fails I will commit myself in patient until those nicotine receptors have been annihilated. I don't drink or do recreational drugs, eat healthy, exercise as i can. But this smoking has to stop. I have a grandson 10 days old.
Medication is not for making yourself numb, it should imo, be used in conjunction with cognitive/behavioral/ therapies.
H.