I would go for a physical exam to make sure nothing is wrong. Unexplained weight loss is usually an indication that something is not right.

I had unexplained weight loss for 2 years and it ended up that Lamictal was damaging my liver. The weight loss stopped after I stopped Lamictal and so did my other symptoms.

I'm not trying to scare you but I would explain everything to a doctor since there could be some underling physical cause.