I doubt this is true. I suggest you get a second opinion.
You need to stop doing that. Amitriptyline has an average half-life of around 15-20 hours, so for most is completely eliminated within 4 days. By taking it every 4-5 days you are purging the drug from your system then taking it again, over and over, creating a withdraw roller-coaster.Now I'm down to 10mg every 4 or 5 days and I'm miserable!
If you can go 5 days without it then you can probably just stop taking it altogether. Weaning off most meds by skipping doses is a very bad idea, imho.
Given what you've been doing it is hard to say whether this is withdrawal, depression, or both. That will only be revealed once you've been completely off the med for a while.Now I'm terrified I'm just depressed and the amitryptlene was masking it..
Or is it lack of sleep.. Food...
Withdrawal alone ( I hope)