Do you also loose strength? Strength is imo a better (more objective) indicator since you either can lift something or you can't while size... well different mirrors, moods, cameras, lighting, might make you appear bigger/smaller so that's not really objective. How long does it take to regain whatever you have lost?
If it's fast then it's just water/glycogen imo... nothing to worry about.
If it's slow then you might be actually loosing muscle.
The rhabdo thing... is that with normal doses which don't cause any problems or is that people taking lots of drugs, becoming temporary psychotic and having to be restrained?
Second, yeah, that will cause some rhabdo... first... idk... any proposed mechanisms? Massive cortisol dump?
And well, steroids.... that will give you more muscle and since you've already been called a druggy.... (to the mods, if it's not obvious, I'm joking and not saying that the op should just go on steroids, that's not for me to suggest
)