My husband was addicted to oxy about a year ago and I have a feeling he is taking something else?

Things just don't seem right, like money being lost etc...maybe I'm being paranoid... I know he is not taking oxy, drug tests are neg and his pupils are not small. He has lost some weight probably 20lbs in a few months and doesnt have a big appetite. He throws up at times for no reason; not every day, but more than a normal person...does anyone have any ideas of street drugs/pills that have these affects?