Actually, since most gum contains xylitol and or sorbitol, and those both act as a laxative, chances are you will be more concerned with the streaks in your undies before the calories in the gum...
No one can really give you an answer that will be a sure thing since everyone is different. Some people who are younger recover well, others are stuck with excess skin permanently.
I began messing around with lifting very ineffectively last summer. Self devised training, abysmal form, etc. Didn't make a lot of progress at all. Have gained a little bit but mostly as a result...
Nutritional concerns aside, eating a bunch of high energy food then jumping into bed and trying to go to sleep, for myself at least, has never proven to be a very successful endeavor in the past.
Well you damn sure didn't lose 4 pounds of muscle in two days, so don't even think that way. The most you could lose mathematically would be about one pound of true mass.
Why do your profile stats say you are 5 ft 8 and 180 pounds? Is that the goal and you are planning to lose two inches of height in the process as well?
I don't know about ice cream, but I scaled out frozen yogurt and was very pleasantly surprised by what the half a cup serving size came out to. Plus it rang in at like 100 calories. I would guess...