Hi...Mr.Ana...welcome to HCM.., I have gone trough your case.., Your case is very pitiable...,but every problem have definite solution., hence don't loose your temper..,
first of all you know about the drug and automatically.., you get rectification.., o.k .As you mentioned drug called...
'
Vyvanse... it is
Amphetamine type medication.., it gives addiction like alcoholic,
smoking etc.. it is used now a days mainly ADHD (Attention Deficit
Hyperactivity Disorder..) it increase the pay attention of the patient ..stay focused and stop fidgity....already you mentioned side effects...but serious side effects related to Heart and blood vessels...There is no relation between Vyvanse and
brain tumour ...no case is detected so far....
hence don't worry about this ...next important thing is tappering the dose and maintaing..that thing is will look after your Doctor o.k..
so remove your doubt from your mind....be cool.... think positive..and good luck.