welcome to HCM
as per the details u have submitted, some amount of weight gain can be possible with prolonged use of Trepiline (amitryptiline).. u can continue low dose of trepiline it works better for fibromyalgia
about purbloka , its beta receptor blocker , in sucha low dose of 10mg, it doesnt affect your metabolism
, only mild bradycardia
is possible ..nothing to worry much about it..