Doxylamine succinate is a powerful anti-cholingernic, it will worsen your symptoms, and its has a sedative effect. its very similar to diphenhydramine.
Doxylamine(which i have taken before i had my neuropathy), causes drowsiness, dry mouth, nose, eyes, it slows down your digestive system, and can lead to constipation. Im taking from my experience from taking diphenhydramine since it has identical side effects and sedative properties to doxylamine. its primarly used as a sleeping aid combined with Night time medication. It is also used uncommonly as a 1ST generation antihistimine.

Before my neuropathy began, which i believed that diphenhydramine had a hand in causing. I had been taking it for more than a month 1 pill a day, sometimes twice, Even if i was only supposed to take it only 10days, for allergies.
The side effects were unpleasant, they made me extremely drowsy, they dried out my mouth and nose(it reduced my allergies), and made my already slow digestive system slower and caused some constipation, and it gave me myclonic and hypnic jerks. I havnt noticed any reduced sweating but im pretty it was present. On another forum, someone said i could be having toxicity effects from DPH. the most unpleasant effect was the sedation, and the waking up from it. doyxlamine should not be taken more than once every 4 hours, peferably not over 10 days. choligernic neuropathy is a version of autonomic neuropathy, and 1st generation anti-histamines affect the autonomic nervous system.