Urgent pls help hamster diarrhea

[cutesthamsterhelppls]

hello, my hamster has been having diarrhea for about 2-3 weeks now. its not watery but more like soft, messy stool? My hamster has also lost almost 20g since it started. I've gone to the vet and went through a round of treatment (the typical antibiotics and probiotics treatment) however It did not work and in fact since startimg the treatment my hamster has lost 15g and diarrhea still ongoing. When I spoke to the vet he told me they dont have the equipment to try to find out the cause of the diarrhea. Anyways Ive been searching around for an exotic vet that can and finally found one however their next available slot is in 2 weeks and that is way too long for a hamster to wait for so I have no choice but to search here for any answers.

My hamster is a 6 month old syrian female and currently other than the diarrhea she seems fine, good appetite and drinking, not dehydrated, not super energetic but then again shes never really been energetic though she still tries very actively to escape.

Prior to the diarrhea, a few things happened. My mother fed it (without me knowing) a biscuit containing some chocolate. This was about a week before the diarrhea and she didnt really seem to have any issue that day so I think this probably wasnt the reason. Second, I was running out of her old brand of food so I fed it a new brand (which was custom mix and better nutrition for her age), this happened pretty much the day before the diarrhea however stopping it and giving her back the old brand did not stop the diarrhea so I doubt it was the main cause. Lastly, it escaped from its cage midnight into this tiny hole that leads into the back of my kitchen stove cabinet. There is a tiny hole in the cabinet through which i can see inside from but only barely. From what I see, there doesnt seem to be anything much other than dust but I have no idea if maybe the kitchen stove has leaked gasoline/fuel (im not sure if stoves are powered by these?) into the hole. I googled and apparently ingesting gasoline is poisonous and I think it (or whatever it ingested from the hole) may be the cause for the diarrhea. I am really freaking out right now please has anyone been through something similar do you think she may have ingested gasoline or fuel or something and if so How can I help her or actually can I even still save her? Thank you