tpt you are doing really well and glad you are feeling more comfortable about your intake it must be really baffling, I a still pre op so can understand why you get anxious about it, everyone is so different.
Protein wise I think PG and Shell always recommend between 40-80 grams a day. I bought the whey protein powder last week from Holland and Barrett as it is half price at the moment, and this will help when I have had my op as I do worry about getting enough protein in, you will be tired if you dont have enough protein.
I got the natural, no flavour, as then I can add it to anything to bumpthe protein up if I am having trouble eating enough.
Hope this helps, but well done on your weight loss so far
Jay xx