20 grams is nothing, I have animals half that size losing as much in one bowel movement.
Fast can last for a few weeks of for several months, it depends on the animal as well as what is done to help the animal resume feeding.
During the winter I keep males in extra small quarters to ensure that they will eat throughout the season.
Males can (even females) can go off feed for various reason.
Changes in weather, breeding season, cathing up because they are over fed etc.
Just make sure that your husbandry is optimal, downsize the enclosure if you think it may help and most importantly be patient.
I never recommend changing prey type in this type of case since it may mean being stuck with this prey type from that point on.
As for the bleeding it's pretty normal after a shed to observe blood in the vent area.
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