Hi, I was on it before I was even dx (with a dx of ME), can't remember dose I was taking then but no ill effects except being bit dozy in morning.
I then spent 5 years off it and tried 3 other drugs for ppms (gabapentin, pregabalin & topamax) all of which gave me side effects esp increasing my tinnitus which I have badly (pregabalin had me in hospital with interruped heartbeat... a rare side effect).
Anyway, (long story short) I asked 2 weeks ago to go back on amitriptyline and glad to be back on it. I think for me it is the only one that doesn't increase the tinnitus and it chills me out in a nice way.
I'm on 25 mg at night and might increase. I'll see how it goes.
One problem only... trouble sleeping! I'm taking it about 8.30 pm and then at around 11pm I'm taking one paracetamol. It's the only way I can get to sleep.
Different drugs suit different people so I guess it's a case of trial and error and hopefully find one that suits you.