We all are very individual. Size 12 - sound great - for some. You still maintain a large weight loss - so not all was bad.
As how many proteins you need - only you and your doc - or nut can tell you that.
The basic is 60-70 gr per day, and then you can adjust to see how you are doing. I am bigger than you are 5'4, large bones muscles - I need 120-150 gr per day. When I do not get that much on a low carb diet (the body will use some proteins as fuel and burn it ) I get low normal protein blood level.
When I do moderate carbs - I need less proteins. But with low carbs - My body will use that as fuel.
I would start with 60-80 gr per day, 800 cal per day, then adjust based on the lab values. Ideally you may want the proteins to be in 7's... (mine currently is 6.7... still trying to get it up... ).
small frequent meals, every 2-3 hrs. 5-7 meals a day. You can do 3 mail means and 2-3 snacks.
Lots of water. (I still can''t do plain - need flavored) and don't forget that we need vitamins and minerals.
When last time you had the FULL blood work done?
if you are low on energy - that may indicate some deficiencies... check that out.
H.a.l.a RNY 5/14/2008 Lost over 100 lbs, now app 162-166..
Maintenance phase of my life; size : 6-10 (depends on a brand)
"Failure is not falling down, It is not getting up once you fell..."
"So pick yourself up, dust yourself off, and start all over again...."