Expired Vyvanse and Potential Contamination: Need Advice

Hi there! In my area of the US I'm having trouble getting Vyvanse. I came across some of my meds that expired in January and was wondering if they are still safe to use for the time being? My motivation is lacking and it's been 3 weeks already without proper medication and it's messing with my attention span and binging heavily. Other question related to the first one is that I had some in a pill cutter as these were flavored chewables, but with being in college and on the go they somehow ended up in my shower stuff. They've maintained their form, but likely have soap on them (though not guaranteed) and I was wondering if I should have those as well or not as it might taste bad, but I can swallow it (which is what I've been doing). Another issue is there was a dead ant in there but it doesn't appear to be infested or anything. Likely as any human, I've probably unintentionally eaten bugs but I don't know if this would also affect its ability. I'm supposed to be on 70 mg but I'm taking 100 right now of the expired stuff as I fear the expiry date has decreased it's effectiveness, though it's all I have and it's better than nothing in my opinion. I would just like further input on this then from anyone else....