Health - promethazine HCL withdrawal

[sci]

Hi guys hope im ok putting this in the right section but cant see any antihistimine section .. been a while since I posted...

anyways mods please move and accept my appologies if needed ...

its regarding promethazine HCL .. swim has been taking now for many weeks.. mild insomniac.. anyways tolerance obviously built up swim was at a stage of taking triple doses.. Swim noticed that during his day he was becoming very clumsy (almost ot ran over by a car) so decided to stop. second night now without and serious insomnia which suppose is normal ..
my question(s) is :
how long before swim can get back to his normal self like hes never taken them and back to his old mild insomnia

and could swim go onto diphenhydramine HCL... does tolerence to promethazine mean tollerence to dip. the effects do feel different

not really very good info on web of comin off them ..
thanks guys..much appreciated