Mousa

Hello all,
I am 4.5 month out from surgery. i am 26 years old, 5' 9 male who used to weigh 352 lbs (on day of surgery) and now i am (264.5). First of all, i am a bit worried that should have lost more than that compared to guys in my age group and weight. I exercise about 3-5 times a week for 1 hour between weight lifting and cardio. My Protein intake is very low and can't manage to top it for some reason. all my blood tests are good except Vitamin D insufficiency and low serum Iron but good hemoglobin levels at 14.6 and everything else looks goods (low cholestrol levels as well). I am just a bit worried that i won't be able to reach my goal weight (200 lbs at least).
So my questions are the following:
88 lbs in 4.5 months bad or ok? ( i know its an improvement but i need to know so i can make some rearrangements)
what should be my calorie intake at this point and what was yours at this time? (my Protein shake on skimmed milk is about 200 calories alone 120+80, which is a lot tbh specially if taken twice per day)
What is your protein intake at this point?
What to do to minimize loose skin at this point or to keep skin healthy?
Your help would be greatly appreciated