Amitriptyline 75mg or above, Anyone have experience?

hello
I suffer from Panic and anxiety disorder. I am prescribed Amitriptyline
+ Clonazepam + Inderal
I start from Amitriptyline 2.5mg titrate to 25mg now, My panic Do get
better while the dose is increased
However, I experience some weird side-effect, such as cold sweat come
out from my forehead suddenly which make me feel anxious.
Recently I read article on the web stating that Amitriptyline 75 mg is
the minimum dose to have therapeutic effect (I believe its the dose for
American, I am not sure if its the same for an asian like me who only
weight about 55 kg)
Anyway, I tend to believe that the day I can titrate to 75mg of
Amitriptyline is the day I am going to be panic-free

My question is:
Does anyone have experience of Amitriptyline 75mg or above? What is
your titration strategy? Do you experience any serious side-effect? Do
you have any tips to share about Amitriptyline (such as how to overcome
the sleepy feeling)? Are you panic-free now?

thank you very much

Eric Lam