Hey TheHez, welcome to BL and BDD
First of all, congratulations for deciding that your drinking is becoming problematic and deciding to do something about it - that is often one of the hardest parts! 5-7 units/day is above the safe recommended maximum and if you are experiencing withdrawal symptoms then it indicates there is a degree of physical dependence there. It's difficult to tell though, if you're not drinking continually though the day then it might be a hangover (which is essentially WD-lite). What symptoms do you get? As I am sure you are aware, alcohol withdrawal can be dangerous so it is important not to just stop abruptly now, but to do a taper or a medically supervised detox using benzodiazepines.
Cutting down is a good plan, and you could try to taper your use that way as your daily intake is not sky high, however if at any point you experience anxiety, tremor, dizziness, temperature disturbance and generally feeling unwell to a greater degree than you usually do it is important that you seek medical help straight away as you may be experiencing Delirium Tremens (DT) which carries a risk of seizures. Visual hallucinations are another sign of DT.
Did you explain to your doctor about your alcohol use and withdrawals? I am very surprised that they did not offer you some assistance with this.
To answer your question - chlorphenamine is a 1st generation antihistamine and can be sedating and also anxiolytic (anxiety relieving) although this is pretty mild. It could be used to help you sleep, although I would see if you can get hold of some promethazine (sold OTC as Phenergan to treat motion sickness, may be other brands too) as this tends to work better. Tolerance can build with continued use, but they are not addictive. Neither ibuprofen or cetirizine are sedating (cetirizine is a 2nd generation antihistamine and does not cross the blood-brain barrier, so has no sedative effects). Weed can help you sleep too.
Be cautious about using promethazine or chlorphenamine if you are experiencing any alcohol withdrawal symptoms as they can sometimes exacerbate them.
I would avoid benzos (other than in a detox supervised by your doctor) as it is easy to switch one addiction for another and they are not a good long term solution for sleep either as tolerance develops. Try good sleep hygiene - go to bed at a set time, hours relaxation before bed, no looking at a screen during that time, warm bath, hot drink, only use your bed for sleeping, get up after half an hour of trying to sleep for 10 mins.. it can take a while to retrain yourself but it really can help.
I would also recommend you check out "The Dark Side" forum here on BL - they deal with addiction and mental health problems, and there is an alcohol megathread. You are also welcome to start your own thread, and you can get a lot of excellent support and advice. It is important to realise that you need to tackle the psychological addiction as well as the physical dependence - counselling and Alcoholics Anonymous are two tools, but there are other options too.
Good luck!
